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Which three months have an average precipitation of around 3.5inches in Seattle?

natural science

Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average precipitation for each month. The average precipitation can be used to describe the climate of a location. A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average.

To describe the average precipitation trends in Seattle, look at the graph. Choice "Feb" is incorrect. Choice "Mar" is incorrect. Choice "Apr" is incorrect. Choice "May" is incorrect. Choice "Jun" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "February, March, and October" is incorrect. February, March, and October each have an average precipitation of around 3.5 inches. Choice "April, May, and November" is incorrect. The average precipitation in April and May is less than 3 inches. And, the average precipitation in November is more than 6 inches. Choice "May, June, and October" is incorrect. October does have an average precipitation of about 3.5 inches. But, the average precipitation in May and June is less than 2 inches.

Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average precipitation for each month. The average precipitation can be used to describe the climate of a location. A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average. To describe the average precipitation trends in Seattle, look at the graph. Choice "Feb" is incorrect. Choice "Mar" is incorrect. Choice "Apr" is incorrect. Choice "May" is incorrect. Choice "Jun" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "February, March, and October" is incorrect. February, March, and October each have an average precipitation of around 3.5 inches. Choice "April, May, and November" is incorrect. The average precipitation in April and May is less than 3 inches. And, the average precipitation in November is more than 6 inches. Choice "May, June, and October" is incorrect. October does have an average precipitation of about 3.5 inches. But, the average precipitation in May and June is less than 2 inches.

February, March, and October

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Which rhetorical appeal is primarily used in this ad?

language science

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals. Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years include an endorsement from a respected organization, such as the American Dental Association feature a testimonial from a "real person" who shares the audience's values use an admired celebrity or athlete as a spokesperson Appeals to logos, or reason, use logic and verifiable evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information cite results of clinical trials or independently conducted studies explain the science behind a product or service emphasize that the product is a financially wise choice anticipate and refute potential counterclaims Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury

The ad appeals to logos, or reason, by citing evidence that proves the vacuum's effectiveness.

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals. Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years include an endorsement from a respected organization, such as the American Dental Association feature a testimonial from a "real person" who shares the audience's values use an admired celebrity or athlete as a spokesperson Appeals to logos, or reason, use logic and verifiable evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information cite results of clinical trials or independently conducted studies explain the science behind a product or service emphasize that the product is a financially wise choice anticipate and refute potential counterclaims Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury The ad appeals to logos, or reason, by citing evidence that proves the vacuum's effectiveness.

logos (reason)

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together.

Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together. Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

The magnetic force is stronger in Pair 2.

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Which of these states is farthest west?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Florida is farthest west.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Florida is farthest west.

Florida

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Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature?

natural science

The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance. The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy.

Each particle in the two samples has the same mass, but the particles in sample A have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B. Because the particles in sample A have the higher average kinetic energy, sample A must have the higher temperature.

The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance. The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy. Each particle in the two samples has the same mass, but the particles in sample A have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B. Because the particles in sample A have the higher average kinetic energy, sample A must have the higher temperature.

sample A

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Which property do these three objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification.

Look at each object. For each object, decide if it has that property. A fuzzy object is covered in soft hair. The wool sweater is fuzzy, but the sandpaper is not. A hard object does not change shape when pressed or squeezed. The tree bark is hard, but the wool sweater is not. A scratchy object is rough and itchy against your skin. All three objects are scratchy. The property that all three objects have in common is scratchy.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. Look at each object. For each object, decide if it has that property. A fuzzy object is covered in soft hair. The wool sweater is fuzzy, but the sandpaper is not. A hard object does not change shape when pressed or squeezed. The tree bark is hard, but the wool sweater is not. A scratchy object is rough and itchy against your skin. All three objects are scratchy. The property that all three objects have in common is scratchy.

scratchy

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Which ocean is highlighted?

social science

Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean.

This is the Pacific Ocean.

Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. This is the Pacific Ocean.

the Pacific Ocean

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger.

Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

The magnitude of the magnetic force is greater in Pair 2.

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger.

Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

The magnitude of the magnetic force is greater in Pair 2.

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Which property do these four objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification.

Look at each object. For each object, decide if it has that property. A lemon has a sour taste. All four objects are sour. A translucent object lets light through. But you cannot see clearly through a translucent object. The green apple is not translucent. A soft object changes shape when pressed or squeezed. The dill pickles, the lime, and the lemon are soft, but the green apple is not. The property that all four objects have in common is sour.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. Look at each object. For each object, decide if it has that property. A lemon has a sour taste. All four objects are sour. A translucent object lets light through. But you cannot see clearly through a translucent object. The green apple is not translucent. A soft object changes shape when pressed or squeezed. The dill pickles, the lime, and the lemon are soft, but the green apple is not. The property that all four objects have in common is sour.

sour

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Which of these states is farthest west?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Texas is farthest west.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Texas is farthest west.

Texas

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Which material is this shield made of?

natural science

A material is a type of matter. Wood, glass, metal, and plastic are common materials.

Look at the picture of the shield. The shield is made of metal. People can use metal shields to protect themselves. Metal is strong. A sharp sword might dent a shield, but a strong shield is hard to break.

A material is a type of matter. Wood, glass, metal, and plastic are common materials. Look at the picture of the shield. The shield is made of metal. People can use metal shields to protect themselves. Metal is strong. A sharp sword might dent a shield, but a strong shield is hard to break.

metal

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Which of these states is farthest west?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Nevada is farthest west.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Nevada is farthest west.

Nevada

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Is Daphnia pulex made up of many cells?

natural science

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes

Daphnia pulex is an animal. Animals are made up of many cells.

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes Daphnia pulex is an animal. Animals are made up of many cells.

yes

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together.

Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together. Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

The magnetic force is stronger in Pair 2.

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Which better describes the De Biesbosch National Park ecosystem?

natural science

An ecosystem is formed when living and nonliving things interact in an environment. There are many types of ecosystems. Here are some ways in which ecosystems can differ from each other: the pattern of weather, or climate the type of soil or water the organisms that live there

A wetland is a type of ecosystem. Wetlands have the following features: land that is covered with water during most of the year, soil that is rich in nutrients, and other water ecosystems nearby. So, De Biesbosch National Park has land that is covered with water during most of the year. It also has other water ecosystems nearby.

An ecosystem is formed when living and nonliving things interact in an environment. There are many types of ecosystems. Here are some ways in which ecosystems can differ from each other: the pattern of weather, or climate the type of soil or water the organisms that live there A wetland is a type of ecosystem. Wetlands have the following features: land that is covered with water during most of the year, soil that is rich in nutrients, and other water ecosystems nearby. So, De Biesbosch National Park has land that is covered with water during most of the year. It also has other water ecosystems nearby.

It has land that is covered with water during most of the year. It also has other water ecosystems nearby.

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Which solution has a higher concentration of green particles?

natural science

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent

In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container. Use the concentration formula to find the number of green particles per milliliter. Solution A has more green particles per milliliter. So, Solution A has a higher concentration of green particles.

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container. Use the concentration formula to find the number of green particles per milliliter. Solution A has more green particles per milliliter. So, Solution A has a higher concentration of green particles.

Solution A

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What is the expected ratio of offspring with blue body feathers to offspring with green body feathers? Choose the most likely ratio.

natural science

Offspring phenotypes: dominant or recessive? How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to appear as the organism's phenotype. If an organism's genotype has at least one dominant allele for a gene, the organism's phenotype will be the dominant allele's version of the gene's trait. If an organism's genotype has only recessive alleles for a gene, the organism's phenotype will be the recessive allele's version of the gene's trait. A Punnett square shows what types of offspring a cross can produce. The expected ratio of offspring types compares how often the cross produces each type of offspring, on average. To write this ratio, count the number of boxes in the Punnett square representing each type. For example, consider the Punnett square below. | F | f F | FF | Ff f | Ff | ff There is 1 box with the genotype FF and 2 boxes with the genotype Ff. So, the expected ratio of offspring with the genotype FF to those with Ff is 1:2.

To determine how many boxes in the Punnett square represent offspring with blue body feathers or green body feathers, consider whether each phenotype is the dominant or recessive allele's version of the body feather color trait. The question tells you that the B allele, which is for green body feathers, is dominant over the b allele, which is for blue body feathers. Blue body feathers is the recessive allele's version of the body feather color trait. A budgerigar parakeet with the recessive version of the body feather color trait must have only recessive alleles for the body feather color gene. So, offspring with blue body feathers must have the genotype bb. There are 0 boxes in the Punnett square with the genotype bb. Green body feathers is the dominant allele's version of the body feather color trait. A budgerigar parakeet with the dominant version of the body feather color trait must have at least one dominant allele for the body feather color gene. So, offspring with green body feathers must have the genotype BB or Bb. All 4 boxes in the Punnett square have the genotype BB or Bb. So, the expected ratio of offspring with blue body feathers to offspring with green body feathers is 0:4. This means that, based on the Punnett square, this cross will never produce offspring with blue body feathers. Instead, this cross is expected to always produce offspring with green body feathers.

Offspring phenotypes: dominant or recessive? How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to appear as the organism's phenotype. If an organism's genotype has at least one dominant allele for a gene, the organism's phenotype will be the dominant allele's version of the gene's trait. If an organism's genotype has only recessive alleles for a gene, the organism's phenotype will be the recessive allele's version of the gene's trait. A Punnett square shows what types of offspring a cross can produce. The expected ratio of offspring types compares how often the cross produces each type of offspring, on average. To write this ratio, count the number of boxes in the Punnett square representing each type. For example, consider the Punnett square below. | F | f F | FF | Ff f | Ff | ff There is 1 box with the genotype FF and 2 boxes with the genotype Ff. So, the expected ratio of offspring with the genotype FF to those with Ff is 1:2. To determine how many boxes in the Punnett square represent offspring with blue body feathers or green body feathers, consider whether each phenotype is the dominant or recessive allele's version of the body feather color trait. The question tells you that the B allele, which is for green body feathers, is dominant over the b allele, which is for blue body feathers. Blue body feathers is the recessive allele's version of the body feather color trait. A budgerigar parakeet with the recessive version of the body feather color trait must have only recessive alleles for the body feather color gene. So, offspring with blue body feathers must have the genotype bb. There are 0 boxes in the Punnett square with the genotype bb. Green body feathers is the dominant allele's version of the body feather color trait. A budgerigar parakeet with the dominant version of the body feather color trait must have at least one dominant allele for the body feather color gene. So, offspring with green body feathers must have the genotype BB or Bb. All 4 boxes in the Punnett square have the genotype BB or Bb. So, the expected ratio of offspring with blue body feathers to offspring with green body feathers is 0:4. This means that, based on the Punnett square, this cross will never produce offspring with blue body feathers. Instead, this cross is expected to always produce offspring with green body feathers.

0:4

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Which of these oceans does the prime meridian intersect?

social science

Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps. Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latitude. We start counting degrees from there. Lines north of the equator are labeled N for north. Lines south of the equator are labeled S for south. Lines of latitude are also called parallels because each line is parallel to the equator. Lines of longitude are also called meridians. They show how far east or west a place is. We use degrees to help describe how far a place is from the prime meridian. The prime meridian is the line located at 0° longitude. Lines west of the prime meridian are labeled W. Lines east of the prime meridian are labeled E. Meridians meet at the north and south poles. The equator goes all the way around the earth, but the prime meridian is different. It only goes from the North Pole to the South Pole on one side of the earth. On the opposite side of the globe is another special meridian. It is labeled both 180°E and 180°W. Together, lines of latitude and lines of longitude form a grid. You can use this grid to find the exact location of a place.

The prime meridian is the line at 0° longitude. It intersects the Arctic Ocean. It does not intersect the Indian Ocean or the Pacific Ocean.

Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps. Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latitude. We start counting degrees from there. Lines north of the equator are labeled N for north. Lines south of the equator are labeled S for south. Lines of latitude are also called parallels because each line is parallel to the equator. Lines of longitude are also called meridians. They show how far east or west a place is. We use degrees to help describe how far a place is from the prime meridian. The prime meridian is the line located at 0° longitude. Lines west of the prime meridian are labeled W. Lines east of the prime meridian are labeled E. Meridians meet at the north and south poles. The equator goes all the way around the earth, but the prime meridian is different. It only goes from the North Pole to the South Pole on one side of the earth. On the opposite side of the globe is another special meridian. It is labeled both 180°E and 180°W. Together, lines of latitude and lines of longitude form a grid. You can use this grid to find the exact location of a place. The prime meridian is the line at 0° longitude. It intersects the Arctic Ocean. It does not intersect the Indian Ocean or the Pacific Ocean.

the Arctic Ocean

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Which animal's limbs are also adapted for swimming?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly.

Look at the picture of the northern elephant seal. The northern elephant seal uses its flippers to push itself through water. The flippers can also help it change direction while swimming. Now look at each animal. Figure out which animal has a similar adaptation. The bottlenose dolphin has flippers. Its limbs are adapted for swimming. The nilgai has long legs. Its limbs are not adapted for swimming. The nilgai uses its limbs to walk and run on land.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly. Look at the picture of the northern elephant seal. The northern elephant seal uses its flippers to push itself through water. The flippers can also help it change direction while swimming. Now look at each animal. Figure out which animal has a similar adaptation. The bottlenose dolphin has flippers. Its limbs are adapted for swimming. The nilgai has long legs. Its limbs are not adapted for swimming. The nilgai uses its limbs to walk and run on land.

bottlenose dolphin

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Select the reptile below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals.

A salmon is a fish. It lives underwater. It has fins, not limbs. Unlike most other fish, salmon can live in both fresh water and salt water. A water buffalo is a mammal. It has hair and feeds its young milk. Water buffaloes live in Asia. Some people raise water buffaloes for their milk. A black howler is a mammal. It has hair and feeds its young milk. Howler monkeys have loud calls, or howls. Their calls can be heard over three miles away! A gharial is a reptile. It has scaly, waterproof skin. Gharials are a type of crocodile. Gharials live near rivers and eat fish.

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. A salmon is a fish. It lives underwater. It has fins, not limbs. Unlike most other fish, salmon can live in both fresh water and salt water. A water buffalo is a mammal. It has hair and feeds its young milk. Water buffaloes live in Asia. Some people raise water buffaloes for their milk. A black howler is a mammal. It has hair and feeds its young milk. Howler monkeys have loud calls, or howls. Their calls can be heard over three miles away! A gharial is a reptile. It has scaly, waterproof skin. Gharials are a type of crocodile. Gharials live near rivers and eat fish.

gharial

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Which is the main persuasive appeal used in this ad?

language science

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals: Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years note that a brand is recommended by a respected organization or celebrity include a quote from a "real person" who shares the audience's values Appeals to logos, or reason, use logic and specific evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information mention the results of scientific studies explain the science behind a product or service Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury

The ad appeals to pathos, or emotion. It links the product to feelings of love and family.

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals: Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years note that a brand is recommended by a respected organization or celebrity include a quote from a "real person" who shares the audience's values Appeals to logos, or reason, use logic and specific evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information mention the results of scientific studies explain the science behind a product or service Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury The ad appeals to pathos, or emotion. It links the product to feelings of love and family.

pathos (emotion)

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Which property do these three objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups.

Look at each object. For each object, decide if it has that property. A slippery object is hard to hold onto or stand on. All three objects are slippery. A rough object feels scratchy when you touch it. The wet paint and the jello are not rough. Yellow is a color. This color is yellow. The wet paint and the jello are not yellow. The property that all three objects have in common is slippery.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Look at each object. For each object, decide if it has that property. A slippery object is hard to hold onto or stand on. All three objects are slippery. A rough object feels scratchy when you touch it. The wet paint and the jello are not rough. Yellow is a color. This color is yellow. The wet paint and the jello are not yellow. The property that all three objects have in common is slippery.

slippery

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Which animal is also adapted for flight?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly.

Look at the picture of the flying fox. The flying fox has large, powerful wings. It is adapted for flight. Long, powerful wings help the flying fox travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The Cape vulture has large, powerful wings. It is adapted for flight. The gaur has long legs. It is not adapted for flight. The gaur uses its legs to walk and run.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly. Look at the picture of the flying fox. The flying fox has large, powerful wings. It is adapted for flight. Long, powerful wings help the flying fox travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The Cape vulture has large, powerful wings. It is adapted for flight. The gaur has long legs. It is not adapted for flight. The gaur uses its legs to walk and run.

Cape vulture

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Based on clues in the text, how did fossil evidence help scientists explain the huge number of beetle species?

language science

Informational texts include many facts, examples, and details. Authors don't always directly state how these things connect to each other. So, you may need to make guesses, or inferences, to understand how the ideas from the text fit together. Inferences can help you understand the whole text and draw conclusions about the information. Be sure to base your inferences on details found in the text as well as things you already know.

Think about these details from the text: Fossils can show how many ancient species have gone extinct. Fossil evidence shows that beetles die out less often than any other animal. Beetles' low extinction rate helps explain the large number of beetle species. In order to show that beetles die out less often than other animals, scientists must have compared different animals' extinction rates. To do this, they would need to figure out how many ancient species have gone extinct. Based on these clues, you can guess that fossil evidence let scientists compare the number of extinct beetles to the number of other extinct animals. This helped them figure out that beetles die out less often than other animals, which explains the huge number of beetle species.

Informational texts include many facts, examples, and details. Authors don't always directly state how these things connect to each other. So, you may need to make guesses, or inferences, to understand how the ideas from the text fit together. Inferences can help you understand the whole text and draw conclusions about the information. Be sure to base your inferences on details found in the text as well as things you already know. Think about these details from the text: Fossils can show how many ancient species have gone extinct. Fossil evidence shows that beetles die out less often than any other animal. Beetles' low extinction rate helps explain the large number of beetle species. In order to show that beetles die out less often than other animals, scientists must have compared different animals' extinction rates. To do this, they would need to figure out how many ancient species have gone extinct. Based on these clues, you can guess that fossil evidence let scientists compare the number of extinct beetles to the number of other extinct animals. This helped them figure out that beetles die out less often than other animals, which explains the huge number of beetle species.

It let scientists compare the number of extinct beetles to the number of other extinct species.

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Does this passage describe the weather or the climate?

natural science

The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere. Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day. Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures.

Read the passage carefully. A high pressure system can push clouds out of an area. It has been clear in the Gobi Desert all week because of a high pressure system in the region. The underlined part of the passage tells you about the barometric pressure in the Gobi Desert this week. This passage describes the atmosphere at a certain place and time. So, this passage describes the weather.

The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere. Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day. Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures. Read the passage carefully. A high pressure system can push clouds out of an area. It has been clear in the Gobi Desert all week because of a high pressure system in the region. The underlined part of the passage tells you about the barometric pressure in the Gobi Desert this week. This passage describes the atmosphere at a certain place and time. So, this passage describes the weather.

weather

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Complete the statement. Chloromethane is ().

natural science

There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you. A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are composed of multiple chemical elements bonded together are compounds. Every chemical element is represented by its own atomic symbol. An atomic symbol may consist of one capital letter, or it may consist of a capital letter followed by a lowercase letter. For example, the atomic symbol for the chemical element boron is B, and the atomic symbol for the chemical element chlorine is Cl. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a ball-and-stick model. The ball-and-stick model below represents a molecule of the compound boron trichloride. In a ball-and-stick model, the balls represent atoms, and the sticks represent bonds. Notice that the balls in the model above are not all the same color. Each color represents a different chemical element. The legend shows the color and the atomic symbol for each chemical element in the substance.

Use the model to determine whether chloromethane is an elementary substance or a compound. Step 1: Interpret the model. . Use the legend to determine the chemical element represented by each color. The colors and atomic symbols from the legend are shown in the table below. The table also includes the names of the chemical elements represented in the model. You can see from the model that a molecule of chloromethane is composed of three hydrogen atoms, one carbon atom, and one chlorine atom bonded together. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that chloromethane is composed of three chemical elements: hydrogen, carbon, and chlorine. Since chloromethane is composed of multiple chemical elements bonded together, chloromethane is a compound.

There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you. A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are composed of multiple chemical elements bonded together are compounds. Every chemical element is represented by its own atomic symbol. An atomic symbol may consist of one capital letter, or it may consist of a capital letter followed by a lowercase letter. For example, the atomic symbol for the chemical element boron is B, and the atomic symbol for the chemical element chlorine is Cl. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a ball-and-stick model. The ball-and-stick model below represents a molecule of the compound boron trichloride. In a ball-and-stick model, the balls represent atoms, and the sticks represent bonds. Notice that the balls in the model above are not all the same color. Each color represents a different chemical element. The legend shows the color and the atomic symbol for each chemical element in the substance. Use the model to determine whether chloromethane is an elementary substance or a compound. Step 1: Interpret the model. . Use the legend to determine the chemical element represented by each color. The colors and atomic symbols from the legend are shown in the table below. The table also includes the names of the chemical elements represented in the model. You can see from the model that a molecule of chloromethane is composed of three hydrogen atoms, one carbon atom, and one chlorine atom bonded together. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that chloromethane is composed of three chemical elements: hydrogen, carbon, and chlorine. Since chloromethane is composed of multiple chemical elements bonded together, chloromethane is a compound.

a compound

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Which solution has a higher concentration of purple particles?

natural science

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent

In Solution A and Solution B, the purple particles represent the solute. To figure out which solution has a higher concentration of purple particles, look at both the number of purple particles and the volume of the solvent in each container. Use the concentration formula to find the number of purple particles per milliliter. Solution B has more purple particles per milliliter. So, Solution B has a higher concentration of purple particles.

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent In Solution A and Solution B, the purple particles represent the solute. To figure out which solution has a higher concentration of purple particles, look at both the number of purple particles and the volume of the solvent in each container. Use the concentration formula to find the number of purple particles per milliliter. Solution B has more purple particles per milliliter. So, Solution B has a higher concentration of purple particles.

Solution B

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Complete the sentence. The mutation in the () affected the structure and function of the ().

natural science

An organism's genes contain information about its proteins. Each gene encodes, or contains the instructions for making, one protein or a group of proteins. A permanent change in a gene is called a mutation. Because a mutation changes a gene, the mutation may change the structure of the protein encoded by that gene. The function of a protein depends on its structure. So, if a mutation in a gene changes a protein's structure, the mutation may also change the protein's function. An organism's observable traits are affected by the functions of its proteins. So, a gene mutation that affects a protein's function may also affect an organism's observable traits.

A mutation in a gene may affect the protein it encodes. So, the mutation in the FliG gene affected the structure and function of the FliG protein.

An organism's genes contain information about its proteins. Each gene encodes, or contains the instructions for making, one protein or a group of proteins. A permanent change in a gene is called a mutation. Because a mutation changes a gene, the mutation may change the structure of the protein encoded by that gene. The function of a protein depends on its structure. So, if a mutation in a gene changes a protein's structure, the mutation may also change the protein's function. An organism's observable traits are affected by the functions of its proteins. So, a gene mutation that affects a protein's function may also affect an organism's observable traits. A mutation in a gene may affect the protein it encodes. So, the mutation in the FliG gene affected the structure and function of the FliG protein.

FliG gene . . . FliG protein

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Which of these states is farthest south?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Kentucky is farthest south.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Kentucky is farthest south.

Kentucky

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Which solution has a higher concentration of blue particles?

natural science

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent

In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container. Use the concentration formula to find the number of blue particles per milliliter. Solution B has more blue particles per milliliter. So, Solution B has a higher concentration of blue particles.

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container. Use the concentration formula to find the number of blue particles per milliliter. Solution B has more blue particles per milliliter. So, Solution B has a higher concentration of blue particles.

Solution B

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Which of these states is farthest north?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the north arrow is pointing. Missouri is farthest north.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the north arrow is pointing. Missouri is farthest north.

Missouri

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Will these magnets attract or repel each other?

natural science

Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces. Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (S). Here are some examples of magnets. Their poles are shown in different colors and labeled. Whether a magnet attracts or repels other magnets depends on the positions of its poles. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel.

To predict if these magnets will attract or repel, look at which poles are closest to each other. The south pole of one magnet is closest to the north pole of the other magnet. Opposite poles attract. So, these magnets will attract each other.

Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces. Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (S). Here are some examples of magnets. Their poles are shown in different colors and labeled. Whether a magnet attracts or repels other magnets depends on the positions of its poles. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel. To predict if these magnets will attract or repel, look at which poles are closest to each other. The south pole of one magnet is closest to the north pole of the other magnet. Opposite poles attract. So, these magnets will attract each other.

attract

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Which animal is also adapted to be camouflaged among dead leaves?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators.

Look at the picture of the leaf-mimic grasshopper. The leaf-mimic grasshopper has a reddish-brown body. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color. The word camouflage means to blend in. Now look at each animal. Figure out which animal has a similar adaptation. The plated leaf chameleon has reddish-brown scales coverings its body. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color. The snowy owl has white feathers covering its body. It is not adapted to be camouflaged among dead leaves.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators. Look at the picture of the leaf-mimic grasshopper. The leaf-mimic grasshopper has a reddish-brown body. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color. The word camouflage means to blend in. Now look at each animal. Figure out which animal has a similar adaptation. The plated leaf chameleon has reddish-brown scales coverings its body. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color. The snowy owl has white feathers covering its body. It is not adapted to be camouflaged among dead leaves.

plated leaf chameleon

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Which of the following organisms is the tertiary consumer in this food web?

natural science

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web.

Tertiary consumers eat secondary consumers. So, in a food web, tertiary consumers have arrows pointing to them from secondary consumers. Secondary consumers have arrows pointing to them from primary consumers. And primary consumers have arrows pointing to them from producers. The beaver has an arrow pointing to it from the silver maple. The silver maple is not a secondary consumer, so the beaver is not a tertiary consumer. The gray fox has an arrow pointing to it from the pine vole. The pine vole is a secondary consumer, so the gray fox is a tertiary consumer. The black racer has an arrow pointing to it from the pine vole. The pine vole is a secondary consumer, so the black racer is a tertiary consumer. The black bear has arrows pointing to it from the persimmon tree, the swallowtail caterpillar, and the beaver. None of these organisms is a secondary consumer, so the black bear is not a tertiary consumer. The silver maple does not have any arrows pointing to it. So, the silver maple is not a tertiary consumer.

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web. Tertiary consumers eat secondary consumers. So, in a food web, tertiary consumers have arrows pointing to them from secondary consumers. Secondary consumers have arrows pointing to them from primary consumers. And primary consumers have arrows pointing to them from producers. The beaver has an arrow pointing to it from the silver maple. The silver maple is not a secondary consumer, so the beaver is not a tertiary consumer. The gray fox has an arrow pointing to it from the pine vole. The pine vole is a secondary consumer, so the gray fox is a tertiary consumer. The black racer has an arrow pointing to it from the pine vole. The pine vole is a secondary consumer, so the black racer is a tertiary consumer. The black bear has arrows pointing to it from the persimmon tree, the swallowtail caterpillar, and the beaver. None of these organisms is a secondary consumer, so the black bear is not a tertiary consumer. The silver maple does not have any arrows pointing to it. So, the silver maple is not a tertiary consumer.

black racer

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Which continent is highlighted?

social science

A continent is one of the major land masses on the earth. Most people say there are seven continents.

This continent is Antarctica.

A continent is one of the major land masses on the earth. Most people say there are seven continents. This continent is Antarctica.

Antarctica

a6db89027f714ed2aaaf5e63fd36c44b

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Select the reptile below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals.

An American toad is an amphibian. It has moist skin and begins its life in water. Toads do not have teeth! They swallow their food whole. A tiger shark is a fish. It lives underwater. It has fins, not limbs. Tiger sharks are nocturnal. This means that they are active mostly at night. A piranha is a fish. It lives underwater. It has fins, not limbs. Piranhas have sharp teeth. Piranhas hunt in groups. A group of piranhas can eat a large animal. A green sea turtle is a reptile. It has scaly, waterproof skin. Sea turtles live in the water, but they lay their eggs on land.

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. An American toad is an amphibian. It has moist skin and begins its life in water. Toads do not have teeth! They swallow their food whole. A tiger shark is a fish. It lives underwater. It has fins, not limbs. Tiger sharks are nocturnal. This means that they are active mostly at night. A piranha is a fish. It lives underwater. It has fins, not limbs. Piranhas have sharp teeth. Piranhas hunt in groups. A group of piranhas can eat a large animal. A green sea turtle is a reptile. It has scaly, waterproof skin. Sea turtles live in the water, but they lay their eggs on land.

green sea turtle

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Can Megaptera novaeangliae cells make their own food?

natural science

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes

Megaptera novaeangliae is an animal. Animal cells cannot make their own food. Animals get their food by digesting other organisms.

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes Megaptera novaeangliae is an animal. Animal cells cannot make their own food. Animals get their food by digesting other organisms.

no

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Complete the text to describe the diagram. Solute particles moved in both directions across the permeable membrane. But more solute particles moved across the membrane (). When there was an equal concentration on both sides, the particles reached equilibrium.

natural science

In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of diffusion. As a result of diffusion, the concentration of solute particles becomes equal throughout the solution. When this happens, the solute particles reach equilibrium. At equilibrium, the solute particles do not stop moving. But their concentration throughout the solution stays the same. Membranes, or thin boundaries, can divide solutions into parts. A membrane is permeable to a solute when particles of the solute can pass through gaps in the membrane. In this case, solute particles can move freely across the membrane from one side to the other. So, for the solute particles to reach equilibrium, more particles will move across a permeable membrane from the side with a higher concentration of solute particles to the side with a lower concentration. At equilibrium, the concentration on both sides of the membrane is equal.

Look at the diagram again. It shows you how the solution changed during the process of diffusion. Before the solute particles reached equilibrium, there were 8 solute particles on the left side of the membrane and 2 solute particles on the right side of the membrane. When the solute particles reached equilibrium, there were 5 solute particles on each side of the membrane. There were 3 more solute particles on the right side of the membrane than before. So, for the solute particles to reach equilibrium, more solute particles must have moved across the membrane to the right than to the left.

In a solution, solute particles move and spread throughout the solvent. The diagram below shows how a solution can change over time. Solute particles move from the area where they are at a higher concentration to the area where they are at a lower concentration. This movement happens through the process of diffusion. As a result of diffusion, the concentration of solute particles becomes equal throughout the solution. When this happens, the solute particles reach equilibrium. At equilibrium, the solute particles do not stop moving. But their concentration throughout the solution stays the same. Membranes, or thin boundaries, can divide solutions into parts. A membrane is permeable to a solute when particles of the solute can pass through gaps in the membrane. In this case, solute particles can move freely across the membrane from one side to the other. So, for the solute particles to reach equilibrium, more particles will move across a permeable membrane from the side with a higher concentration of solute particles to the side with a lower concentration. At equilibrium, the concentration on both sides of the membrane is equal. Look at the diagram again. It shows you how the solution changed during the process of diffusion. Before the solute particles reached equilibrium, there were 8 solute particles on the left side of the membrane and 2 solute particles on the right side of the membrane. When the solute particles reached equilibrium, there were 5 solute particles on each side of the membrane. There were 3 more solute particles on the right side of the membrane than before. So, for the solute particles to reach equilibrium, more solute particles must have moved across the membrane to the right than to the left.

to the right than to the left

213cbed8504949dcaeb02263df3ccf9a

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Which animal's feet are also adapted for digging?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground.

Look at the picture of the star-nosed mole. The star-nosed mole has long, straight claws. Its feet are adapted for digging. The star-nosed mole uses its claws to break up soil and move it out of the way. Now look at each animal. Figure out which animal has a similar adaptation. The honey badger has long, straight claws. Its feet are adapted for digging. The blue-footed booby has small claws and webbed feet. Its feet are not adapted for digging. The blue-footed booby uses its feet to swim.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground. Look at the picture of the star-nosed mole. The star-nosed mole has long, straight claws. Its feet are adapted for digging. The star-nosed mole uses its claws to break up soil and move it out of the way. Now look at each animal. Figure out which animal has a similar adaptation. The honey badger has long, straight claws. Its feet are adapted for digging. The blue-footed booby has small claws and webbed feet. Its feet are not adapted for digging. The blue-footed booby uses its feet to swim.

honey badger

0d8e7ac2eff04e5cb7bb7317d03b4a51

validation_images/image_640.png

Which animal's skin is also adapted for survival in cold places?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators.

Look at the picture of the Arctic wolf. The Arctic wolf has thick fur covering its skin. Its skin is adapted for survival in cold places. The Arctic wolf uses its fur to keep warm in cold weather. Now look at each animal. Figure out which animal has a similar adaptation. The musk ox has skin with thick fur on top and a thick layer of fat underneath it. Its skin is adapted for survival in cold places. The armadillo lizard has scales covering much of its skin. Its skin is not adapted for survival in cold places.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators. Look at the picture of the Arctic wolf. The Arctic wolf has thick fur covering its skin. Its skin is adapted for survival in cold places. The Arctic wolf uses its fur to keep warm in cold weather. Now look at each animal. Figure out which animal has a similar adaptation. The musk ox has skin with thick fur on top and a thick layer of fat underneath it. Its skin is adapted for survival in cold places. The armadillo lizard has scales covering much of its skin. Its skin is not adapted for survival in cold places.

musk ox

ad60c2f8b7914e0f8752fcb3e12a61b3

validation_images/image_641.png

Will these magnets attract or repel each other?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south. Here are some examples of magnets. The north pole of each magnet is labeled N, and the south pole is labeled S. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel.

To predict if these magnets will attract or repel, look at which poles are closest to each other. The north pole of one magnet is closest to the south pole of the other magnet. Opposite poles attract. So, these magnets will attract each other.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south. Here are some examples of magnets. The north pole of each magnet is labeled N, and the south pole is labeled S. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel. To predict if these magnets will attract or repel, look at which poles are closest to each other. The north pole of one magnet is closest to the south pole of the other magnet. Opposite poles attract. So, these magnets will attract each other.

attract

e89f730f54664ed6b3bfcd410b003eef

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Which animal is also adapted for flight?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly.

Look at the picture of the gray-headed albatross. The gray-headed albatross has long, powerful wings. It is adapted for flight. Long, powerful wings help the gray-headed albatross travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The flamingo has large, powerful wings. It is adapted for flight. The northern elephant seal has flippers. It is not adapted for flight. The northern elephant seal uses its flippers to swim underwater.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. Arms, legs, flippers, and wings are different types of limbs. The type of limbs an animal has is an example of an adaptation. Animals' limbs can be adapted in different ways. For example, long legs might help an animal run fast. Flippers might help an animal swim. Wings might help an animal fly. Look at the picture of the gray-headed albatross. The gray-headed albatross has long, powerful wings. It is adapted for flight. Long, powerful wings help the gray-headed albatross travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The flamingo has large, powerful wings. It is adapted for flight. The northern elephant seal has flippers. It is not adapted for flight. The northern elephant seal uses its flippers to swim underwater.

flamingo

c7d82aa6ce1544c2a19df06c8890d373

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Select the amphibian below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common. Scientists sort animals into groups based on traits they have in common. This process is called classification.

A keel-billed toucan is a bird. It has feathers, two wings, and a beak. A barking tree frog is an amphibian. It has moist skin and begins its life in water.

Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common. Scientists sort animals into groups based on traits they have in common. This process is called classification. A keel-billed toucan is a bird. It has feathers, two wings, and a beak. A barking tree frog is an amphibian. It has moist skin and begins its life in water.

barking tree frog

b927a55005794a6f84b6a3e6684d233f

validation_images/image_644.png

Select the fish below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals.

A green chameleon is a reptile. It has scaly, waterproof skin. Chameleons eat insects. They use their long, sticky tongues to catch their prey. A porcupinefish is a fish. It lives underwater. It has fins, not limbs. Porcupinefish can puff up their bodies with air or water to scare off predators. A European green toad is an amphibian. It has moist skin and begins its life in water. Toads do not have teeth! They swallow their food whole. A zebra is a mammal. It has hair and feeds its young milk. Zebras eat mostly grass. But they sometimes eat other types of plants, such as shrubs or tree bark.

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. A green chameleon is a reptile. It has scaly, waterproof skin. Chameleons eat insects. They use their long, sticky tongues to catch their prey. A porcupinefish is a fish. It lives underwater. It has fins, not limbs. Porcupinefish can puff up their bodies with air or water to scare off predators. A European green toad is an amphibian. It has moist skin and begins its life in water. Toads do not have teeth! They swallow their food whole. A zebra is a mammal. It has hair and feeds its young milk. Zebras eat mostly grass. But they sometimes eat other types of plants, such as shrubs or tree bark.

porcupinefish

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Which animal is also adapted to be camouflaged in the snow?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators.

Look at the picture of the ptarmigan. During the winter, the ptarmigan has white feathers covering its body. It is adapted to be camouflaged in the snow. The word camouflage means to blend in. Now look at each animal. Figure out which animal has a similar adaptation. This Arctic wolf has white fur covering its body. It is adapted to be camouflaged in the snow. The porcupine has black-and-white spines covering its body. It is not adapted to be camouflaged in the snow.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators. Look at the picture of the ptarmigan. During the winter, the ptarmigan has white feathers covering its body. It is adapted to be camouflaged in the snow. The word camouflage means to blend in. Now look at each animal. Figure out which animal has a similar adaptation. This Arctic wolf has white fur covering its body. It is adapted to be camouflaged in the snow. The porcupine has black-and-white spines covering its body. It is not adapted to be camouflaged in the snow.

Arctic wolf

4d43da01971241a8b31ee515d6ae02b3

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Is the following statement about our solar system true or false? Neptune's volume is more than 50 times as great as that of Earth.

natural science

A planet's volume tells you the size of the planet. The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.

To determine if this statement is true, calculate the value of 50 times the volume of Earth. Then compare the result to the volume of Neptune. The volume of Neptune is 62,530 billion km^3, which is more than 54,500 billion km^3. So, Neptune's volume is more than 50 times as great as that of Earth.

A planet's volume tells you the size of the planet. The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice. To determine if this statement is true, calculate the value of 50 times the volume of Earth. Then compare the result to the volume of Neptune. The volume of Neptune is 62,530 billion km^3, which is more than 54,500 billion km^3. So, Neptune's volume is more than 50 times as great as that of Earth.

true

7adb149f1c604ad19e5d34a7ca675861

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Is potassium feldspar a mineral?

natural science

Properties are used to identify different substances. Minerals have the following properties: It is a solid. It is formed in nature. It is not made by organisms. It is a pure substance. It has a fixed crystal structure. If a substance has all five of these properties, then it is a mineral. Look closely at the last three properties: A mineral is not made by organisms. Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals. Humans are organisms too. So, substances that humans make by hand or in factories cannot be minerals. A mineral is a pure substance. A pure substance is made of only one type of matter. All minerals are pure substances. A mineral has a fixed crystal structure. The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms or molecules in different pieces of the same type of mineral are always arranged the same way.

Potassium feldspar has all the properties of a mineral. So, potassium feldspar is a mineral.

Properties are used to identify different substances. Minerals have the following properties: It is a solid. It is formed in nature. It is not made by organisms. It is a pure substance. It has a fixed crystal structure. If a substance has all five of these properties, then it is a mineral. Look closely at the last three properties: A mineral is not made by organisms. Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals. Humans are organisms too. So, substances that humans make by hand or in factories cannot be minerals. A mineral is a pure substance. A pure substance is made of only one type of matter. All minerals are pure substances. A mineral has a fixed crystal structure. The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms or molecules in different pieces of the same type of mineral are always arranged the same way. Potassium feldspar has all the properties of a mineral. So, potassium feldspar is a mineral.

yes

efa1819654ec4d01aeaedc147d9193f9

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.

The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same. So, the magnitude of the magnetic force is the same in both pairs.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same. So, the magnitude of the magnetic force is the same in both pairs.

The magnitude of the magnetic force is the same in both pairs.

e8b66460e9fb47448dc074048fedd31b

validation_images/image_649.png

Which animal's feet are also adapted to walk on snow and ice?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground.

Look at the picture of the snow leopard. The snow leopard has furry feet with large pads. Its feet are adapted to walk on snow and ice. The fur can help keep the snow leopard's feet warm. The large pads help spread its weight over a larger area. This allows it to walk on ice without slipping and to walk on snow without sinking in too deep. Now look at each animal. Figure out which animal has a similar adaptation. The brown bear has furry feet with large pads. Its feet are adapted to walk on snow and ice. The horse has hooves. Its feet are not adapted to walk on snow and ice. The horse uses its feet to walk and run on surfaces covered by soil.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur might help an animal walk on cold, snowy ground. Look at the picture of the snow leopard. The snow leopard has furry feet with large pads. Its feet are adapted to walk on snow and ice. The fur can help keep the snow leopard's feet warm. The large pads help spread its weight over a larger area. This allows it to walk on ice without slipping and to walk on snow without sinking in too deep. Now look at each animal. Figure out which animal has a similar adaptation. The brown bear has furry feet with large pads. Its feet are adapted to walk on snow and ice. The horse has hooves. Its feet are not adapted to walk on snow and ice. The horse uses its feet to walk and run on surfaces covered by soil.

brown bear

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validation_images/image_650.png

Select the reptile below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common. Scientists sort animals into groups based on traits they have in common. This process is called classification.

A green frog is an amphibian. It has moist skin and begins its life in water. Frogs live near water or in damp places. Most frogs lay their eggs in water. A Galapagos giant tortoise is a reptile. It has scaly, waterproof skin. Galapagos tortoises live on the Galapagos Islands in the Pacific Ocean. They can live to be over 150 years old!

Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common. Scientists sort animals into groups based on traits they have in common. This process is called classification. A green frog is an amphibian. It has moist skin and begins its life in water. Frogs live near water or in damp places. Most frogs lay their eggs in water. A Galapagos giant tortoise is a reptile. It has scaly, waterproof skin. Galapagos tortoises live on the Galapagos Islands in the Pacific Ocean. They can live to be over 150 years old!

Galapagos giant tortoise

d39dea5dcd984deeb161a22b106d8d85

validation_images/image_651.png

Which property matches this object?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.

Look at the object. Think about each property. A sticky object can attach or stick to other things. The fish bowl is not sticky. A smooth object is not scratchy or rough. The fish bowl is smooth.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Look at the object. Think about each property. A sticky object can attach or stick to other things. The fish bowl is not sticky. A smooth object is not scratchy or rough. The fish bowl is smooth.

smooth

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Which property do these four objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification.

Look at each object. For each object, decide if it has that property. A fragile object will break into pieces if you drop it. All four objects are fragile. An opaque object does not let light through. The ceramic plate is opaque, but the glass flask, the glass bottle, and the icicle are not. Sugar has a sweet taste. The ceramic plate and the icicle are not sweet. The property that all four objects have in common is fragile.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. Look at each object. For each object, decide if it has that property. A fragile object will break into pieces if you drop it. All four objects are fragile. An opaque object does not let light through. The ceramic plate is opaque, but the glass flask, the glass bottle, and the icicle are not. Sugar has a sweet taste. The ceramic plate and the icicle are not sweet. The property that all four objects have in common is fragile.

fragile

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validation_images/image_653.png

Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is greater when there is a smaller distance between the magnets.

The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater. There is a smaller distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is greater in Pair 1 than in Pair 2.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is greater when there is a smaller distance between the magnets. The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater. There is a smaller distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is greater in Pair 1 than in Pair 2.

The magnitude of the magnetic force is greater in Pair 1.

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Which three months have the same average precipitation?

natural science

Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data. A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average.

To describe the average precipitation trends in Chicago, look at the graph. Choice "Mar" is incorrect. Choice "Apr" is incorrect. Choice "May" is incorrect. Choice "Jun" is incorrect. Choice "Jul" is incorrect. Choice "Aug" is incorrect. Choice "Sep" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "June, July, and August" is incorrect. The average precipitation for these three months is different. The average precipitation in August is more than an inch higher than the average precipitation in June and July. Choice "March, April, and May" is incorrect. The average precipitation for these three months is different. The average precipitation in April and May is more than 3 inches. But, the average precipitation in March is less than 3 inches. Choice "September, October, and November" is incorrect. The average precipitation in September, October, and November is just over 3 inches. Every other month has an average precipitation that is either higher or lower than these three months.

Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data. A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average. To describe the average precipitation trends in Chicago, look at the graph. Choice "Mar" is incorrect. Choice "Apr" is incorrect. Choice "May" is incorrect. Choice "Jun" is incorrect. Choice "Jul" is incorrect. Choice "Aug" is incorrect. Choice "Sep" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "June, July, and August" is incorrect. The average precipitation for these three months is different. The average precipitation in August is more than an inch higher than the average precipitation in June and July. Choice "March, April, and May" is incorrect. The average precipitation for these three months is different. The average precipitation in April and May is more than 3 inches. But, the average precipitation in March is less than 3 inches. Choice "September, October, and November" is incorrect. The average precipitation in September, October, and November is just over 3 inches. Every other month has an average precipitation that is either higher or lower than these three months.

September, October, and November

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is greater when there is a smaller distance between the magnets.

Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater. There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is greater when there is a smaller distance between the magnets. Distance affects the magnitude of the magnetic force. When there is a smaller distance between magnets, the magnitude of the magnetic force between them is greater. There is a smaller distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is greater in Pair 2 than in Pair 1.

The magnitude of the magnetic force is greater in Pair 2.

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Which continent is highlighted?

social science

A continent is one of the seven largest areas of land on earth.

This continent is North America.

A continent is one of the seven largest areas of land on earth. This continent is North America.

North America

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Which property matches this object?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.

Look at the object. Think about each property. Yellow is a color. This color is yellow. The slide is yellow. A fuzzy object is covered in soft hair. The slide is not fuzzy.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Look at the object. Think about each property. Yellow is a color. This color is yellow. The slide is yellow. A fuzzy object is covered in soft hair. The slide is not fuzzy.

yellow

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Will these magnets attract or repel each other?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south. Here are some examples of magnets. The north pole of each magnet is marked N, and the south pole is marked S. If different poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same poles are closest to each other, the magnets repel. The magnets in both pairs below repel.

Will these magnets attract or repel? To find out, look at which poles are closest to each other. The north pole of one magnet is closest to the north pole of the other magnet. Poles that are the same repel. So, these magnets will repel each other.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south. Here are some examples of magnets. The north pole of each magnet is marked N, and the south pole is marked S. If different poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same poles are closest to each other, the magnets repel. The magnets in both pairs below repel. Will these magnets attract or repel? To find out, look at which poles are closest to each other. The north pole of one magnet is closest to the north pole of the other magnet. Poles that are the same repel. So, these magnets will repel each other.

repel

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Select the organism in the same species as the peregrine falcon.

natural science

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.

A peregrine falcon's scientific name is Falco peregrinus. Pelecanus philippensis does not have the same scientific name as a peregrine falcon. So, Falco peregrinus and Pelecanus philippensis are not in the same species. Pelecanus occidentalis does not have the same scientific name as a peregrine falcon. So, Falco peregrinus and Pelecanus occidentalis are not in the same species. Falco peregrinus has the same scientific name as a peregrine falcon. So, these organisms are in the same species.

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur. A peregrine falcon's scientific name is Falco peregrinus. Pelecanus philippensis does not have the same scientific name as a peregrine falcon. So, Falco peregrinus and Pelecanus philippensis are not in the same species. Pelecanus occidentalis does not have the same scientific name as a peregrine falcon. So, Falco peregrinus and Pelecanus occidentalis are not in the same species. Falco peregrinus has the same scientific name as a peregrine falcon. So, these organisms are in the same species.

Falco peregrinus

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Which of these organisms contains matter that was once part of the bear sedge?

natural science

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web.

Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows that starts from the bear sedge. Arrows point to the mushroom from the grizzly bear and the barren-ground caribou. The only arrows pointing to the grizzly bear start from the barren-ground caribou and the bilberry. The only arrow pointing to the barren-ground caribou starts from the lichen. No arrow points to the lichen or the bilberry. So, in this food web, matter does not move from the bear sedge to the mushroom. Arrows point to the grizzly bear from the bilberry and the barren-ground caribou. The only arrow pointing to the barren-ground caribou starts from the lichen. No arrow points to the lichen or the bilberry. So, in this food web, matter does not move from the bear sedge to the grizzly bear.

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web. Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows that starts from the bear sedge. Arrows point to the mushroom from the grizzly bear and the barren-ground caribou. The only arrows pointing to the grizzly bear start from the barren-ground caribou and the bilberry. The only arrow pointing to the barren-ground caribou starts from the lichen. No arrow points to the lichen or the bilberry. So, in this food web, matter does not move from the bear sedge to the mushroom. Arrows point to the grizzly bear from the bilberry and the barren-ground caribou. The only arrow pointing to the barren-ground caribou starts from the lichen. No arrow points to the lichen or the bilberry. So, in this food web, matter does not move from the bear sedge to the grizzly bear.

earthworm

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Select the organism in the same species as the silver gull.

natural science

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.

A silver gull's scientific name is Chroicocephalus novaehollandiae. Chroicocephalus novaehollandiae has the same scientific name as a silver gull. So, these organisms are in the same species. Goura victoria does not have the same scientific name as a silver gull. So, Chroicocephalus novaehollandiae and Goura victoria are not in the same species. Goura cristata does not have the same scientific name as a silver gull. So, Chroicocephalus novaehollandiae and Goura cristata are not in the same species.

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur. A silver gull's scientific name is Chroicocephalus novaehollandiae. Chroicocephalus novaehollandiae has the same scientific name as a silver gull. So, these organisms are in the same species. Goura victoria does not have the same scientific name as a silver gull. So, Chroicocephalus novaehollandiae and Goura victoria are not in the same species. Goura cristata does not have the same scientific name as a silver gull. So, Chroicocephalus novaehollandiae and Goura cristata are not in the same species.

Chroicocephalus novaehollandiae

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Which bird's beak is also adapted to tear through meat?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. A short, thick beak might help a bird break through a seed's hard shell. Birds that eat similar food often have similar beaks.

Look at the picture of the white-backed vulture. The white-backed vulture has a sharp hooked beak. Its beak is adapted to tear through meat. The sharp hook can help the white-backed vulture cut the meat into pieces it can swallow. Now look at each bird. Figure out which bird has a similar adaptation. The bald eagle has a sharp hooked beak. Its beak is adapted to tear through meat. The hoopoe has a long, thin beak. Its beak is not adapted to tear through meat.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. A short, thick beak might help a bird break through a seed's hard shell. Birds that eat similar food often have similar beaks. Look at the picture of the white-backed vulture. The white-backed vulture has a sharp hooked beak. Its beak is adapted to tear through meat. The sharp hook can help the white-backed vulture cut the meat into pieces it can swallow. Now look at each bird. Figure out which bird has a similar adaptation. The bald eagle has a sharp hooked beak. Its beak is adapted to tear through meat. The hoopoe has a long, thin beak. Its beak is not adapted to tear through meat.

bald eagle

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Which ocean is highlighted?

social science

Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean.

This is the Indian Ocean.

Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. This is the Indian Ocean.

the Indian Ocean

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Select the organism in the same genus as the red kangaroo.

natural science

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.

A red kangaroo's scientific name is Macropus rufus. The first word of its scientific name is Macropus. Lepus americanus is in the genus Lepus. The first word of its scientific name is Lepus. So, Lepus americanus and Macropus rufus are not in the same genus. Lynx rufus and Macropus rufus are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Lynx rufus and Macropus rufus have the same species name within their genus, rufus. But the first words of their scientific names are different. Lynx rufus is in the genus Lynx, and Macropus rufus is in the genus Macropus. Macropus giganteus is in the genus Macropus. The first word of its scientific name is Macropus. So, Macropus giganteus and Macropus rufus are in the same genus.

Scientists use scientific names to identify organisms. Scientific names are made of two words. The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits. A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus. Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus. Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur. A red kangaroo's scientific name is Macropus rufus. The first word of its scientific name is Macropus. Lepus americanus is in the genus Lepus. The first word of its scientific name is Lepus. So, Lepus americanus and Macropus rufus are not in the same genus. Lynx rufus and Macropus rufus are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Lynx rufus and Macropus rufus have the same species name within their genus, rufus. But the first words of their scientific names are different. Lynx rufus is in the genus Lynx, and Macropus rufus is in the genus Macropus. Macropus giganteus is in the genus Macropus. The first word of its scientific name is Macropus. So, Macropus giganteus and Macropus rufus are in the same genus.

Macropus giganteus

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Which solution has a higher concentration of green particles?

natural science

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent

In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container. Use the concentration formula to find the number of green particles per milliliter. Solution B has more green particles per milliliter. So, Solution B has a higher concentration of green particles.

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container. Use the concentration formula to find the number of green particles per milliliter. Solution B has more green particles per milliliter. So, Solution B has a higher concentration of green particles.

Solution B

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together.

Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is stronger when the magnets are closer together. Distance affects the strength of the magnetic force. When magnets are closer together, the magnetic force between them is stronger. The magnets in Pair 2 are closer together than the magnets in Pair 1. So, the magnetic force is stronger in Pair 2 than in Pair 1.

The magnetic force is stronger in Pair 2.

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Which solution has a higher concentration of blue particles?

natural science

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent

In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container. Use the concentration formula to find the number of blue particles per milliliter. Solution A has more blue particles per milliliter. So, Solution A has a higher concentration of blue particles.

A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution. In this case, the salt is the solute. The water is the solvent. The concentration of a solute in a solution is a measure of the ratio of solute to solvent. Concentration can be described in terms of particles of solute per volume of solvent. concentration = particles of solute / volume of solvent In Solution A and Solution B, the blue particles represent the solute. To figure out which solution has a higher concentration of blue particles, look at both the number of blue particles and the volume of the solvent in each container. Use the concentration formula to find the number of blue particles per milliliter. Solution A has more blue particles per milliliter. So, Solution A has a higher concentration of blue particles.

Solution A

7bf50f035f3c4c1680f6dd772403fb53

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is weaker when the magnets are farther apart.

Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker. The magnets in Pair 1 are farther apart than the magnets in Pair 2. So, the magnetic force is weaker in Pair 1 than in Pair 2.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is weaker when the magnets are farther apart. Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker. The magnets in Pair 1 are farther apart than the magnets in Pair 2. So, the magnetic force is weaker in Pair 1 than in Pair 2.

The magnetic force is weaker in Pair 1.

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Which material is this bridge made of?

natural science

A material is a type of matter. Wood, glass, metal, and plastic are common materials. Some objects are made of just one material. Most nails are made of metal. Other objects are made of more than one material. This hammer is made of metal and wood.

Look at the picture of the bridge. The bridge is made of two different materials. The surface is asphalt. The rest of the bridge is made of metal. Asphalt and metal are good materials to build bridges with. Both materials are strong. They hold up well in cold or rainy weather.

A material is a type of matter. Wood, glass, metal, and plastic are common materials. Some objects are made of just one material. Most nails are made of metal. Other objects are made of more than one material. This hammer is made of metal and wood. Look at the picture of the bridge. The bridge is made of two different materials. The surface is asphalt. The rest of the bridge is made of metal. Asphalt and metal are good materials to build bridges with. Both materials are strong. They hold up well in cold or rainy weather.

metal

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Which is this organism's scientific name?

natural science

An organism's common name is the name that people normally call the organism. Common names often contain words you know. An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English. Scientific names are written in italics, but common names are usually not. The first word of the scientific name is capitalized, and the second word is not. For example, the common name of the animal below is giant panda. Its scientific name is Ailuropoda melanoleuca.

Aequorea victoria is written in italics. The first word is capitalized, and the second word is not. So, Aequorea victoria is the scientific name.

An organism's common name is the name that people normally call the organism. Common names often contain words you know. An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English. Scientific names are written in italics, but common names are usually not. The first word of the scientific name is capitalized, and the second word is not. For example, the common name of the animal below is giant panda. Its scientific name is Ailuropoda melanoleuca. Aequorea victoria is written in italics. The first word is capitalized, and the second word is not. So, Aequorea victoria is the scientific name.

Aequorea victoria

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Which property matches this object?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells.

Look at the object. Think about each property. A smooth object is not scratchy or rough. The rock are not smooth. A bumpy object is covered in lumps and bumps. The rock are bumpy.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Look at the object. Think about each property. A smooth object is not scratchy or rough. The rock are not smooth. A bumpy object is covered in lumps and bumps. The rock are bumpy.

bumpy

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What produces sperm and eggs?

natural science

Moss plants reproduce using both asexual reproduction and sexual reproduction. Moss plants use their male and female parts for sexual reproduction. The male parts produce sperm. Moss live in damp environments, and moss sperm can travel through water to the female parts. The sperm fuse with eggs in the female part. This is called fertilization. Self-fertilization happens when a sperm from a moss plant fertilizes an egg from the same plant. Cross-fertilization happens when a sperm from one moss plant fertilizes an egg from a different moss plant. The fertilized egg grows into a thin brown stalk on top of the female part. Each stalk has a small spore capsule at the top. Moss plants use asexual reproduction to make small spores in the capsules. When the capsules open, the spores are released. When the spores land on the ground, they may germinate and grow into a new moss plant. This new moss plant can produce eggs and sperm and begin the moss life cycle again.

An adult moss plant produces eggs and sperm. Spores may germinate and grow into an adult moss plant, but spores do not produce eggs and sperm themselves.

Moss plants reproduce using both asexual reproduction and sexual reproduction. Moss plants use their male and female parts for sexual reproduction. The male parts produce sperm. Moss live in damp environments, and moss sperm can travel through water to the female parts. The sperm fuse with eggs in the female part. This is called fertilization. Self-fertilization happens when a sperm from a moss plant fertilizes an egg from the same plant. Cross-fertilization happens when a sperm from one moss plant fertilizes an egg from a different moss plant. The fertilized egg grows into a thin brown stalk on top of the female part. Each stalk has a small spore capsule at the top. Moss plants use asexual reproduction to make small spores in the capsules. When the capsules open, the spores are released. When the spores land on the ground, they may germinate and grow into a new moss plant. This new moss plant can produce eggs and sperm and begin the moss life cycle again. An adult moss plant produces eggs and sperm. Spores may germinate and grow into an adult moss plant, but spores do not produce eggs and sperm themselves.

an adult moss plant

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Complete the statement. Chloromethane is ().

natural science

All substances are made of one or more chemical elements, or types of atoms. Substances that are made of only one chemical element are elementary substances. Substances that are made of two or more chemical elements bonded together are compounds. Every chemical element is represented by its own symbol. For some elements, the symbol is one capital letter. For other elements, the symbol is one capital letter and one lowercase letter. For example, the symbol for the chemical element boron is B, and the symbol for the chemical element chlorine is Cl. Scientists can use models to represent molecules. A ball-and-stick model of a molecule is shown below. This model represents a molecule of the compound boron trichloride. In a ball-and-stick model, the balls represent atoms, and the sticks represent chemical bonds. Notice how each ball is labeled with a symbol for a chemical element. The ball represents one atom of that element.

Count the number of chemical elements represented in the model. Then, decide if chloromethane is an elementary substance or a compound. In this model, each ball is labeled with C for carbon, H for hydrogen, or Cl for chlorine. So, the model shows you that chloromethane is made of three chemical elements bonded together. Substances made of two or more chemical elements bonded together are compounds. So, chloromethane is a compound.

All substances are made of one or more chemical elements, or types of atoms. Substances that are made of only one chemical element are elementary substances. Substances that are made of two or more chemical elements bonded together are compounds. Every chemical element is represented by its own symbol. For some elements, the symbol is one capital letter. For other elements, the symbol is one capital letter and one lowercase letter. For example, the symbol for the chemical element boron is B, and the symbol for the chemical element chlorine is Cl. Scientists can use models to represent molecules. A ball-and-stick model of a molecule is shown below. This model represents a molecule of the compound boron trichloride. In a ball-and-stick model, the balls represent atoms, and the sticks represent chemical bonds. Notice how each ball is labeled with a symbol for a chemical element. The ball represents one atom of that element. Count the number of chemical elements represented in the model. Then, decide if chloromethane is an elementary substance or a compound. In this model, each ball is labeled with C for carbon, H for hydrogen, or Cl for chlorine. So, the model shows you that chloromethane is made of three chemical elements bonded together. Substances made of two or more chemical elements bonded together are compounds. So, chloromethane is a compound.

a compound

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is smaller when the magnets are smaller.

The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The smaller the magnets, the smaller the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is smaller in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is smaller when the magnets are smaller. The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The smaller the magnets, the smaller the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is smaller in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.

The magnitude of the magnetic force is smaller in Pair 2.

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.

The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same. So, the magnitude of the magnetic force is the same in both pairs.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same. So, the magnitude of the magnetic force is the same in both pairs.

The magnitude of the magnetic force is the same in both pairs.

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Is limestone a mineral or a rock?

natural science

Minerals are the building blocks of rocks. A rock can be made of one or more minerals. Minerals and rocks have the following properties: Property | Mineral | Rock It is a solid. | Yes | Yes It is formed in nature. | Yes | Yes It is not made by organisms. | Yes | Yes It is a pure substance. | Yes | No It has a fixed crystal structure. | Yes | No You can use these properties to tell whether a substance is a mineral, a rock, or neither. Look closely at the last three properties: Minerals and rocks are not made by organisms. Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals or rocks. Humans are organisms too. So, substances that humans make by hand or in factories are not minerals or rocks. A mineral is a pure substance, but a rock is not. A pure substance is made of only one type of matter. Minerals are pure substances, but rocks are not. Instead, all rocks are mixtures. A mineral has a fixed crystal structure, but a rock does not. The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms and molecules in different pieces of the same type of mineral are always arranged the same way. However, rocks do not have a fixed crystal structure. So, the arrangement of atoms or molecules in different pieces of the same type of rock may be different!

Limestone is a rock that forms from ocean sediment. The sediment in limestone is made mostly of the shells of marine organisms. But the rock itself is not made by organisms. It forms deep below Earth's surface when layers of sediment are pressed together to form rock.

Minerals are the building blocks of rocks. A rock can be made of one or more minerals. Minerals and rocks have the following properties: Property | Mineral | Rock It is a solid. | Yes | Yes It is formed in nature. | Yes | Yes It is not made by organisms. | Yes | Yes It is a pure substance. | Yes | No It has a fixed crystal structure. | Yes | No You can use these properties to tell whether a substance is a mineral, a rock, or neither. Look closely at the last three properties: Minerals and rocks are not made by organisms. Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals or rocks. Humans are organisms too. So, substances that humans make by hand or in factories are not minerals or rocks. A mineral is a pure substance, but a rock is not. A pure substance is made of only one type of matter. Minerals are pure substances, but rocks are not. Instead, all rocks are mixtures. A mineral has a fixed crystal structure, but a rock does not. The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms and molecules in different pieces of the same type of mineral are always arranged the same way. However, rocks do not have a fixed crystal structure. So, the arrangement of atoms or molecules in different pieces of the same type of rock may be different! Limestone is a rock that forms from ocean sediment. The sediment in limestone is made mostly of the shells of marine organisms. But the rock itself is not made by organisms. It forms deep below Earth's surface when layers of sediment are pressed together to form rock.

rock

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Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature?

natural science

The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance. The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy.

The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A. Because the particles in sample B have the higher average kinetic energy, sample B must have the higher temperature.

The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance. The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy. The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A. Because the particles in sample B have the higher average kinetic energy, sample B must have the higher temperature.

sample B

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Will these magnets attract or repel each other?

natural science

Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces. Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (S). Here are some examples of magnets. Their poles are shown in different colors and labeled. Whether a magnet attracts or repels other magnets depends on the positions of its poles. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel.

To predict if these magnets will attract or repel, look at which poles are closest to each other. Both poles of each magnet line up with both poles of the other magnet. The north pole of each magnet is closest to the north pole of the other magnet. Like poles repel. So, these magnets will repel each other.

Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces. Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (S). Here are some examples of magnets. Their poles are shown in different colors and labeled. Whether a magnet attracts or repels other magnets depends on the positions of its poles. If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract. If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel. To predict if these magnets will attract or repel, look at which poles are closest to each other. Both poles of each magnet line up with both poles of the other magnet. The north pole of each magnet is closest to the north pole of the other magnet. Like poles repel. So, these magnets will repel each other.

repel

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Is Nembrotha megalocera made up of many cells?

natural science

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes

Nembrotha megalocera is an animal. Animals are made up of many cells.

In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms. Organisms in each kingdom have specific traits. The table below shows some traits used to describe each kingdom. | Bacteria | Archaea | Protists | Fungi | Animals | Plants How many cells do they have? | one | one | one or many | one or many | many | many Do their cells have a nucleus? | no | no | yes | yes | yes | yes Can their cells make food? | some species can | some species can | some species can | no | no | yes Nembrotha megalocera is an animal. Animals are made up of many cells.

yes

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Which of the following fossils is younger? Select the more likely answer.

natural science

A fossil is the preserved evidence of an ancient organism. Some fossils are formed from body parts such as bones or shells. Other fossils, such as footprints or burrows, are formed from traces of an organism's activities. Fossils are typically found in sedimentary rocks. Sedimentary rocks usually form in layers. Over time, new layers are added on top of old layers in a series called a rock sequence. The layers in an undisturbed rock sequence are in the same order as when they formed. So, the deeper layers are older than the shallower layers. The relative ages of fossils can be determined from their positions in an undisturbed rock sequence. Older fossils are usually in deeper layers, and younger fossils are usually in shallower layers.

Look again at the fossils in the rock sequence diagram. Compare the positions of these fossils to determine which one is younger: The fern fossil is in a shallower layer in the rock sequence than the dinosaur footprint fossil. So, the fern fossil is most likely younger than the dinosaur footprint fossil.

A fossil is the preserved evidence of an ancient organism. Some fossils are formed from body parts such as bones or shells. Other fossils, such as footprints or burrows, are formed from traces of an organism's activities. Fossils are typically found in sedimentary rocks. Sedimentary rocks usually form in layers. Over time, new layers are added on top of old layers in a series called a rock sequence. The layers in an undisturbed rock sequence are in the same order as when they formed. So, the deeper layers are older than the shallower layers. The relative ages of fossils can be determined from their positions in an undisturbed rock sequence. Older fossils are usually in deeper layers, and younger fossils are usually in shallower layers. Look again at the fossils in the rock sequence diagram. Compare the positions of these fossils to determine which one is younger: The fern fossil is in a shallower layer in the rock sequence than the dinosaur footprint fossil. So, the fern fossil is most likely younger than the dinosaur footprint fossil.

fern

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Which of the following organisms is the secondary consumer in this food web?

natural science

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web.

Secondary consumers eat primary consumers, and primary consumers eat producers. So, in a food web, secondary consumers have arrows pointing to them from primary consumers. Primary consumers have arrows pointing to them from producers. The swallowtail caterpillar has an arrow pointing to it from the persimmon tree. The persimmon tree is not a primary consumer, so the swallowtail caterpillar is not a secondary consumer. The beaver has an arrow pointing to it from the silver maple. The silver maple is not a primary consumer, so the beaver is not a secondary consumer. The persimmon tree does not have any arrows pointing to it. So, the persimmon tree is not a secondary consumer. The black bear has arrows pointing to it from the swallowtail caterpillar and the beaver. The swallowtail caterpillar and the beaver are primary consumers, so the black bear is a secondary consumer. The bobcat has an arrow pointing to it from the beaver. The beaver is a primary consumer, so the bobcat is a secondary consumer.

A food web is a model. A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web shows how some organisms in an ecosystem can get their food. Arrows show how matter moves. A food web has arrows that point from one organism to another. Each arrow shows the direction that matter moves when one organism eats another organism. An arrow starts from the organism that is eaten. The arrow points to the organism that is doing the eating. An organism in a food web can have more than one arrow pointing from it. This shows that the organism is eaten by more than one other organism in the food web. An organism in a food web can also have more than one arrow pointing to it. This shows that the organism eats more than one other organism in the food web. Secondary consumers eat primary consumers, and primary consumers eat producers. So, in a food web, secondary consumers have arrows pointing to them from primary consumers. Primary consumers have arrows pointing to them from producers. The swallowtail caterpillar has an arrow pointing to it from the persimmon tree. The persimmon tree is not a primary consumer, so the swallowtail caterpillar is not a secondary consumer. The beaver has an arrow pointing to it from the silver maple. The silver maple is not a primary consumer, so the beaver is not a secondary consumer. The persimmon tree does not have any arrows pointing to it. So, the persimmon tree is not a secondary consumer. The black bear has arrows pointing to it from the swallowtail caterpillar and the beaver. The swallowtail caterpillar and the beaver are primary consumers, so the black bear is a secondary consumer. The bobcat has an arrow pointing to it from the beaver. The beaver is a primary consumer, so the bobcat is a secondary consumer.

black bear

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Which property matches this object?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.

Look at the object. Think about each property. A soft object changes shape when pressed or squeezed. The soccer shorts are soft. You can see clearly through a transparent object. The soccer shorts are not transparent.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Look at the object. Think about each property. A soft object changes shape when pressed or squeezed. The soccer shorts are soft. You can see clearly through a transparent object. The soccer shorts are not transparent.

soft

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Which of these states is farthest west?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Florida is farthest west.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Florida is farthest west.

Florida

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger.

The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is greater in Pair 1 than in Pair 2.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by using magnets of different sizes. The magnitude of the magnetic force is greater when the magnets are larger. The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Magnet sizes affect the magnitude of the magnetic force. Imagine magnets that are the same shape and made of the same material. The larger the magnets, the greater the magnitude of the magnetic force between them. Magnet A is the same size in both pairs. But Magnet B is larger in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is greater in Pair 1 than in Pair 2.

The magnitude of the magnetic force is greater in Pair 1.

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Which better describes the Daintree rain forest ecosystem?

natural science

An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment. There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestrial ecosystems can differ from each other: the pattern of weather, or climate the type of soil the organisms that live there

A tropical rain forest is a type of ecosystem. Tropical rain forests have the following features: year-round rain and warm temperatures, soil that is poor in nutrients, and many different types of organisms. So, the Daintree rain forest has year-round warm temperatures. It also has soil that is poor in nutrients.

An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment. There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestrial ecosystems can differ from each other: the pattern of weather, or climate the type of soil the organisms that live there A tropical rain forest is a type of ecosystem. Tropical rain forests have the following features: year-round rain and warm temperatures, soil that is poor in nutrients, and many different types of organisms. So, the Daintree rain forest has year-round warm temperatures. It also has soil that is poor in nutrients.

It has year-round warm temperatures. It also has soil that is poor in nutrients.

e067dc34e7d6416b99faa0d27d7b637d

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Is ocean water a solid, a liquid, or a gas?

natural science

Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms. When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own. Some solids can be easily folded, bent, or broken. A piece of paper is a solid. Also, some solids are very small. A grain of sand is a solid. When matter is a liquid, it has a definite volume but not a definite shape. So, a liquid has a size of its own, but it does not have a shape of its own. Think about pouring juice from a bottle into a cup. The juice still takes up the same amount of space, but it takes the shape of the bottle. Some liquids are thicker than others. Honey and milk are both liquids. But pouring honey takes more time than pouring milk. When matter is a gas, it does not have a definite volume or a definite shape. A gas expands, or gets bigger, until it completely fills a space. A gas can also get smaller if it is squeezed into a smaller space. Many gases are invisible. The oxygen you breathe is a gas. The helium in a balloon is also a gas.

Ocean water is a liquid. A liquid takes the shape of any container it is in. If you pour some ocean water into a bucket, the ocean water will take the shape of the bucket. But the ocean water will still take up the same amount of space.

Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms. When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own. Some solids can be easily folded, bent, or broken. A piece of paper is a solid. Also, some solids are very small. A grain of sand is a solid. When matter is a liquid, it has a definite volume but not a definite shape. So, a liquid has a size of its own, but it does not have a shape of its own. Think about pouring juice from a bottle into a cup. The juice still takes up the same amount of space, but it takes the shape of the bottle. Some liquids are thicker than others. Honey and milk are both liquids. But pouring honey takes more time than pouring milk. When matter is a gas, it does not have a definite volume or a definite shape. A gas expands, or gets bigger, until it completely fills a space. A gas can also get smaller if it is squeezed into a smaller space. Many gases are invisible. The oxygen you breathe is a gas. The helium in a balloon is also a gas. Ocean water is a liquid. A liquid takes the shape of any container it is in. If you pour some ocean water into a bucket, the ocean water will take the shape of the bucket. But the ocean water will still take up the same amount of space.

a liquid

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Which property do these two objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Different objects can have the same properties. You can use these properties to put objects into groups.

Look at each object. For each object, decide if it has that property. A bendable object can be bent without breaking. Neither of the objects are bendable. A breakable object will break into pieces if you drop it. Both objects are breakable. The property that both objects have in common is breakable.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Different objects can have the same properties. You can use these properties to put objects into groups. Look at each object. For each object, decide if it has that property. A bendable object can be bent without breaking. Neither of the objects are bendable. A breakable object will break into pieces if you drop it. Both objects are breakable. The property that both objects have in common is breakable.

breakable

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Which property do these three objects have in common?

natural science

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification.

Look at each object. For each object, decide if it has that property. A lemon has a sour taste. All three objects are sour. You can see clearly through a transparent object. The green apple and the lemon are not transparent. A translucent object lets light through. But you cannot see clearly through a translucent object. The green apple is not translucent. The property that all three objects have in common is sour.

An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it. Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. Look at each object. For each object, decide if it has that property. A lemon has a sour taste. All three objects are sour. You can see clearly through a transparent object. The green apple and the lemon are not transparent. A translucent object lets light through. But you cannot see clearly through a translucent object. The green apple is not translucent. The property that all three objects have in common is sour.

sour

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Which of these states is farthest south?

social science

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map.

To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Illinois is farthest south.

Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west. A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction. The north arrow points to the North Pole. On most maps, north is at the top of the map. To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Illinois is farthest south.

Illinois

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Which material is this binder made of?

natural science

A material is a type of matter. Wood, glass, metal, and plastic are common materials. Some objects are made of just one material. Most nails are made of metal. Other objects are made of more than one material. This hammer is made of metal and wood.

Look at the picture of the binder. The binder is made of two different materials. The cover is made of plastic, and the rings are made of metal.

A material is a type of matter. Wood, glass, metal, and plastic are common materials. Some objects are made of just one material. Most nails are made of metal. Other objects are made of more than one material. This hammer is made of metal and wood. Look at the picture of the binder. The binder is made of two different materials. The cover is made of plastic, and the rings are made of metal.

metal

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Is the following statement about our solar system true or false? The volume of Uranus is less than one-tenth of the volume of Saturn.

natural science

A planet's volume tells you the size of the planet. The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice.

To determine if this statement is true, calculate the value of one-tenth the volume of Saturn. Then compare the result to the volume of Uranus. The volume of Uranus is 68,300 billion km^3, which is less than 82,713 billion km^3. So, the volume of Uranus is less than one-tenth the volume of Saturn.

A planet's volume tells you the size of the planet. The primary composition of a planet is what the planet is made mainly of. In our solar system, planets are made mainly of rock, gas, or ice. To determine if this statement is true, calculate the value of one-tenth the volume of Saturn. Then compare the result to the volume of Uranus. The volume of Uranus is 68,300 billion km^3, which is less than 82,713 billion km^3. So, the volume of Uranus is less than one-tenth the volume of Saturn.

true

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Which statement describes the Cerrado ecosystem?

natural science

An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment. There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestrial ecosystems can differ from each other: the pattern of weather, or climate the type of soil the organisms that live there

A savanna grassland is a type of ecosystem. Savanna grasslands have the following features: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. So, the following statements describe the Cerrado ecosystem: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. It has a rainy season and a dry season. It has warm summers and warm winters. The following statement does not describe the Cerrado: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. It has cool summers and long, cold winters.

An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment. There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestrial ecosystems can differ from each other: the pattern of weather, or climate the type of soil the organisms that live there A savanna grassland is a type of ecosystem. Savanna grasslands have the following features: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. So, the following statements describe the Cerrado ecosystem: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. It has a rainy season and a dry season. It has warm summers and warm winters. The following statement does not describe the Cerrado: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. It has cool summers and long, cold winters.

It has a rainy season and a dry season.

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Which bird's beak is also adapted to crack large, hard nuts?

natural science

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. A short, thick beak might help a bird break through a seed's hard shell. Birds that eat similar food often have similar beaks.

Look at the picture of the military macaw. The military macaw has a thick hooked beak. Its beak is adapted to crack large, hard nuts. The military macaw uses its thick beak to crack the shell of a nut by squeezing it. The hooked shape of the beak can help the bird hold the nut in place while cracking it. Now look at each bird. Figure out which bird has a similar adaptation. The palm cockatoo has a thick hooked beak. Its beak is adapted to crack large, hard nuts. The blue rock pigeon has a short, thin beak. Its beak is not adapted to crack large, hard nuts.

An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors. The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. A short, thick beak might help a bird break through a seed's hard shell. Birds that eat similar food often have similar beaks. Look at the picture of the military macaw. The military macaw has a thick hooked beak. Its beak is adapted to crack large, hard nuts. The military macaw uses its thick beak to crack the shell of a nut by squeezing it. The hooked shape of the beak can help the bird hold the nut in place while cracking it. Now look at each bird. Figure out which bird has a similar adaptation. The palm cockatoo has a thick hooked beak. Its beak is adapted to crack large, hard nuts. The blue rock pigeon has a short, thin beak. Its beak is not adapted to crack large, hard nuts.

palm cockatoo

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Which is the main persuasive appeal used in this ad?

language science

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals: Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years note that a brand is recommended by a respected organization or celebrity include a quote from a "real person" who shares the audience's values Appeals to logos, or reason, use logic and specific evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information mention the results of scientific studies explain the science behind a product or service Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury

The ad appeals to ethos, or character. It includes a recommendation from a respected organization.

The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals: Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one of the following: say that a brand has been trusted for many years note that a brand is recommended by a respected organization or celebrity include a quote from a "real person" who shares the audience's values Appeals to logos, or reason, use logic and specific evidence. An ad that appeals to logos might do one of the following: use graphs or charts to display information mention the results of scientific studies explain the science behind a product or service Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following: trigger a fear, such as the fear of embarrassment appeal to a desire, such as the desire to appear attractive link the product to a positive feeling, such as adventure, love, or luxury The ad appeals to ethos, or character. It includes a recommendation from a respected organization.

ethos (character)

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Which type of force from the boat causes the water skier to move across the water?

natural science

A force is a push or a pull that one object applies to a second object. The direction of a push is away from the object that is pushing. The direction of a pull is toward the object that is pulling.

The boat applies a force to the water skier. This force causes the water skier to move across the water. The direction of this force is toward the boat. This force is a pull.

A force is a push or a pull that one object applies to a second object. The direction of a push is away from the object that is pushing. The direction of a pull is toward the object that is pulling. The boat applies a force to the water skier. This force causes the water skier to move across the water. The direction of this force is toward the boat. This force is a pull.

pull

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Select the amphibian below.

natural science

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals.

A water buffalo is a mammal. It has hair and feeds its young milk. Water buffaloes live in Asia. Some people raise water buffaloes for their milk. A seahorse is a fish. It lives underwater. It has fins, not limbs. Seahorses live in shallow, warm water. They can use their tails to hold on to plants. A gray tree frog is an amphibian. It has moist skin and begins its life in water. There are many kinds of tree frogs. Most tree frogs are very small. They can walk on thin branches. A painted stork is a bird. It has feathers, two wings, and a beak. Storks wade in shallow water to look for food. Storks eat fish, insects, worms, and other small animals.

Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification. Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. A water buffalo is a mammal. It has hair and feeds its young milk. Water buffaloes live in Asia. Some people raise water buffaloes for their milk. A seahorse is a fish. It lives underwater. It has fins, not limbs. Seahorses live in shallow, warm water. They can use their tails to hold on to plants. A gray tree frog is an amphibian. It has moist skin and begins its life in water. There are many kinds of tree frogs. Most tree frogs are very small. They can walk on thin branches. A painted stork is a bird. It has feathers, two wings, and a beak. Storks wade in shallow water to look for food. Storks eat fish, insects, worms, and other small animals.

gray tree frog

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What is the direction of this pull?

natural science

One object can make another object move with a push or a pull. The direction of a push is away from the object that is pushing. The direction of a pull is toward the object that is pulling.

The builder pulls the bucket toward his body. The bucket moves up to where he is working. The direction of the pull is toward the builder's body.

One object can make another object move with a push or a pull. The direction of a push is away from the object that is pushing. The direction of a pull is toward the object that is pulling. The builder pulls the bucket toward his body. The bucket moves up to where he is working. The direction of the pull is toward the builder's body.

toward the builder's body

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During this time, thermal energy was transferred from () to ().

natural science

A change in an object's temperature indicates a change in the object's thermal energy: An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings. A decrease in temperature shows that the object's thermal energy decreased. So, thermal energy was transferred out of the object to its surroundings.

The temperature of each cake decreased, which means that the thermal energy of each cake decreased. So, thermal energy was transferred from each cake to the surroundings.

A change in an object's temperature indicates a change in the object's thermal energy: An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings. A decrease in temperature shows that the object's thermal energy decreased. So, thermal energy was transferred out of the object to its surroundings. The temperature of each cake decreased, which means that the thermal energy of each cake decreased. So, thermal energy was transferred from each cake to the surroundings.

each cake . . . the surroundings

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Think about the magnetic force between the magnets in each pair. Which of the following statements is true?

natural science

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is smaller when there is a greater distance between the magnets.

The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller. There is a greater distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.

Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces. The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other. You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is smaller when there is a greater distance between the magnets. The magnets in Pair 1 attract. The magnets in Pair 2 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force. Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller. There is a greater distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1.

The magnitude of the magnetic force is smaller in Pair 2.

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