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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 south pole of one magnet is closest to the north pole of the other magnet. Poles that are different 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, 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 south pole of one magnet is closest to the north pole of the other magnet. Poles that are different attract. So, these magnets will attract each other.

attract

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Which of these continents 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 Antarctica. It does not intersect Asia or South America.

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 Antarctica. It does not intersect Asia or South America.

Antarctica

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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.

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 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 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 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 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. You can see clearly through a transparent object. None of the objects are transparent. Blue is a color. This color is blue. None of the objects are blue. A hard object does not change shape when pressed or squeezed. All three objects are hard. The property that all three objects have in common is hard.

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. You can see clearly through a transparent object. None of the objects are transparent. Blue is a color. This color is blue. None of the objects are blue. A hard object does not change shape when pressed or squeezed. All three objects are hard. The property that all three objects have in common is hard.

hard

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Based on the event chain, what happens right after the battle at Mermaids' Lagoon?

language science

A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another. When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doing this can help you think about the ideas in the text and easily review them. When you write, you can use graphic organizers to organize your thoughts and plan your writing.

An event chain uses arrows to show the order of events. This event chain shows events from Peter and Wendy by J. M. Barrie. Follow the arrows to see the order of events. An arrow points from The Lost Boys fight pirates at Mermaids' Lagoon to Wendy remembers her parents. This tells you that right after the battle at Mermaids' Lagoon, Wendy remembers her parents.

A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another. When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doing this can help you think about the ideas in the text and easily review them. When you write, you can use graphic organizers to organize your thoughts and plan your writing. An event chain uses arrows to show the order of events. This event chain shows events from Peter and Wendy by J. M. Barrie. Follow the arrows to see the order of events. An arrow points from The Lost Boys fight pirates at Mermaids' Lagoon to Wendy remembers her parents. This tells you that right after the battle at Mermaids' Lagoon, Wendy remembers her parents.

Wendy remembers her parents.

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Which material is this bucket 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 bucket. The bucket is made of two different materials. The body is made of plastic, and the handle is made of metal. Plastic is a great material for buckets because plastic is waterproof.

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 bucket. The bucket is made of two different materials. The body is made of plastic, and the handle is made of metal. Plastic is a great material for buckets because plastic is waterproof.

plastic

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Select the organism in the same species as the great egret.

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 great egret's scientific name is Ardea alba. Balearica pavonina does not have the same scientific name as a great egret. So, Ardea alba and Balearica pavonina are not in the same species. Ardea alba has the same scientific name as a great egret. So, these organisms are in the same species. Falco novaeseelandiae does not have the same scientific name as a great egret. So, Ardea alba and Falco novaeseelandiae 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 great egret's scientific name is Ardea alba. Balearica pavonina does not have the same scientific name as a great egret. So, Ardea alba and Balearica pavonina are not in the same species. Ardea alba has the same scientific name as a great egret. So, these organisms are in the same species. Falco novaeseelandiae does not have the same scientific name as a great egret. So, Ardea alba and Falco novaeseelandiae are not in the same species.

Ardea alba

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Select the organism in the same species as the European green toad.

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 European green toad's scientific name is Bufo viridis. Lithobates blairi does not have the same scientific name as a European green toad. So, Bufo viridis and Lithobates blairi are not in the same species. Bufo viridis has the same scientific name as a European green toad. So, these organisms are in the same species. Hyla cinerea does not have the same scientific name as a European green toad. So, Bufo viridis and Hyla cinerea 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 European green toad's scientific name is Bufo viridis. Lithobates blairi does not have the same scientific name as a European green toad. So, Bufo viridis and Lithobates blairi are not in the same species. Bufo viridis has the same scientific name as a European green toad. So, these organisms are in the same species. Hyla cinerea does not have the same scientific name as a European green toad. So, Bufo viridis and Hyla cinerea are not in the same species.

Bufo viridis

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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. Indiana 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. Indiana is farthest west.

Indiana

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Complete the statement. Silicon 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 fluorine is F, and the atomic symbol for the chemical element beryllium is Be. 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 the compound pyrite. 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 silicon is an elementary substance or a compound. Step 1: Interpret the model. In the ball-and-stick model shown above, all of the balls are the same color: . The legend shows that beige represents the chemical element with the atomic symbol Si. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that silicon is composed of only one chemical element. So, silicon is an elementary substance.

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 fluorine is F, and the atomic symbol for the chemical element beryllium is Be. 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 the compound pyrite. 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 silicon is an elementary substance or a compound. Step 1: Interpret the model. In the ball-and-stick model shown above, all of the balls are the same color: . The legend shows that beige represents the chemical element with the atomic symbol Si. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that silicon is composed of only one chemical element. So, silicon is an elementary substance.

an elementary substance

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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 Pacific Ocean or the Indian 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 Pacific Ocean or the Indian Ocean.

the Arctic 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 changing the distance between them. The magnitude of the magnetic force is smaller when there is a greater distance between the magnets.

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 1 than in Pair 2. So, the magnitude of the magnetic force is smaller 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 smaller when there is a greater distance between the magnets. 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 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2.

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

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Which better describes the Bering Land Bridge National Preserve 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 tundra is a type of ecosystem. Tundras have the following features: long, cold winters and short, cold summers, soil that is frozen year-round, and mostly small plants. So, Bering Land Bridge National Preserve has long, cold winters. It also has soil that is frozen year-round.

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 tundra is a type of ecosystem. Tundras have the following features: long, cold winters and short, cold summers, soil that is frozen year-round, and mostly small plants. So, Bering Land Bridge National Preserve has long, cold winters. It also has soil that is frozen year-round.

It has long, cold winters. It also has soil that is frozen year-round.

33d81ee647c44e96b008391801440db5

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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.

a5c4fa0b496e40019a0d96033641cc81

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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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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 A has more mass than each particle 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. The particles in both samples have the same average speed, but each particle in sample A has more mass than each particle 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 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 Europe.

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

Europe

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Select the organism in the same genus as the blue jay.

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 blue jay's scientific name is Cyanocitta cristata. The first word of its scientific name is Cyanocitta. Goura cristata and Cyanocitta cristata are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Goura cristata and Cyanocitta cristata have the same species name within their genus, cristata. But the first words of their scientific names are different. Goura cristata is in the genus Goura, and Cyanocitta cristata is in the genus Cyanocitta. Cyanocitta stelleri is in the genus Cyanocitta. The first word of its scientific name is Cyanocitta. So, Cyanocitta stelleri and Cyanocitta cristata are in the same genus. Strix aluco is in the genus Strix. The first word of its scientific name is Strix. So, Strix aluco and Cyanocitta cristata are not 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 blue jay's scientific name is Cyanocitta cristata. The first word of its scientific name is Cyanocitta. Goura cristata and Cyanocitta cristata are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Goura cristata and Cyanocitta cristata have the same species name within their genus, cristata. But the first words of their scientific names are different. Goura cristata is in the genus Goura, and Cyanocitta cristata is in the genus Cyanocitta. Cyanocitta stelleri is in the genus Cyanocitta. The first word of its scientific name is Cyanocitta. So, Cyanocitta stelleri and Cyanocitta cristata are in the same genus. Strix aluco is in the genus Strix. The first word of its scientific name is Strix. So, Strix aluco and Cyanocitta cristata are not in the same genus.

Cyanocitta stelleri

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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 scratchy object is rough and itchy against your skin. The wet paint and the wet ice cube are not scratchy. A rough object feels scratchy when you touch it. The wet paint and the wet ice cube are not rough. 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 scratchy object is rough and itchy against your skin. The wet paint and the wet ice cube are not scratchy. A rough object feels scratchy when you touch it. The wet paint and the wet ice cube are not rough. The property that all three objects have in common is slippery.

slippery

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Which of these states is farthest east?

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 east arrow is pointing. Florida is farthest east.

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 east arrow is pointing. Florida is farthest east.

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.

The particles in both samples have the same average speed, but each particle in sample A has more mass than each particle 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. The particles in both samples have the same average speed, but each particle in sample A has more mass than each particle 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 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. Michigan 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. Michigan is farthest north.

Michigan

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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 fuzzy object is covered in soft hair. All three objects are fuzzy. Blue is a color. This color is blue. The kiwi and the tennis ball are not blue. A fragile object will break into pieces if you drop it. The socks and the tennis ball are not fragile. The property that all three objects have in common is 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. 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 fuzzy object is covered in soft hair. All three objects are fuzzy. Blue is a color. This color is blue. The kiwi and the tennis ball are not blue. A fragile object will break into pieces if you drop it. The socks and the tennis ball are not fragile. The property that all three objects have in common is fuzzy.

fuzzy

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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 ethos, or character, by referring to real users who endorse the headphones.

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 ethos, or character, by referring to real users who endorse the headphones.

ethos (character)

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Which animal's skin is better adapted as a warning sign to ward off predators?

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 sharpnose-puffer. The sharpnose-puffer has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The bright colors serve as a warning sign that the sharpnose-puffer is poisonous. Now look at each animal. Figure out which animal has a similar adaptation. The fire salamander has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The peppered moth has gray and brown patches on its body. Its skin is not adapted to be a warning sign that wards off predators.

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 sharpnose-puffer. The sharpnose-puffer has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The bright colors serve as a warning sign that the sharpnose-puffer is poisonous. Now look at each animal. Figure out which animal has a similar adaptation. The fire salamander has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The peppered moth has gray and brown patches on its body. Its skin is not adapted to be a warning sign that wards off predators.

fire salamander

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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. Connecticut 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. Connecticut is farthest north.

Connecticut

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Is basalt 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!

The properties of basalt match the properties of a rock. So, basalt is a 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! The properties of basalt match the properties of a rock. So, basalt is a rock.

rock

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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 moray eel is a fish. It lives underwater. It has fins, not limbs. Eels are long and thin. They may have small fins. They look like snakes, but they are fish! A woodpecker is a bird. It has feathers, two wings, and a beak. Woodpeckers have strong beaks. They use their beaks to drill into wood to hunt for food. A rabbit is a mammal. It has fur and feeds its young milk. Rabbits live underground in burrows. A group of rabbit burrows is called a warren. A bald eagle is a bird. It has feathers, two wings, and a beak. Bald eagles live in trees near water. They build nests that can be up to 13 feet wide!

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 moray eel is a fish. It lives underwater. It has fins, not limbs. Eels are long and thin. They may have small fins. They look like snakes, but they are fish! A woodpecker is a bird. It has feathers, two wings, and a beak. Woodpeckers have strong beaks. They use their beaks to drill into wood to hunt for food. A rabbit is a mammal. It has fur and feeds its young milk. Rabbits live underground in burrows. A group of rabbit burrows is called a warren. A bald eagle is a bird. It has feathers, two wings, and a beak. Bald eagles live in trees near water. They build nests that can be up to 13 feet wide!

green moray eel

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Which better describes the Everglades 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, Everglades 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, Everglades 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 in water during most of the year. It also has other water ecosystems nearby.

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Which specific humidity level was measured within the outlined area shown?

natural science

To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show specific humidity, a measurement of the amount of water vapor in the air. The map's legend tells you the specific humidity level that each color represents. Colors on the left in the legend represent lower specific humidity levels than colors on the right. For example, areas on the map that are the darkest shade of purple have a specific humidity from zero grams per kilogram (g/kg) up to two g/kg. Areas that are the next darkest shade of purple have a specific humidity from two g/kg up to four g/kg.

Look at the colors shown within the outlined area. Then, use the legend to determine which specific humidity levels those colors represent. The legend tells you that this air mass contained air with specific humidity levels between 2 and 8 grams of water vapor per kilogram of air. 3 grams of water vapor per kilogram of air is within this range. 11 and 12 grams of water vapor per kilogram of air are outside of this range.

To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show specific humidity, a measurement of the amount of water vapor in the air. The map's legend tells you the specific humidity level that each color represents. Colors on the left in the legend represent lower specific humidity levels than colors on the right. For example, areas on the map that are the darkest shade of purple have a specific humidity from zero grams per kilogram (g/kg) up to two g/kg. Areas that are the next darkest shade of purple have a specific humidity from two g/kg up to four g/kg. Look at the colors shown within the outlined area. Then, use the legend to determine which specific humidity levels those colors represent. The legend tells you that this air mass contained air with specific humidity levels between 2 and 8 grams of water vapor per kilogram of air. 3 grams of water vapor per kilogram of air is within this range. 11 and 12 grams of water vapor per kilogram of air are outside of this range.

3 grams of water vapor per kilogram of air

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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 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. 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.

3f4007093c2a4b7785ccb799270695ba

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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 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 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 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 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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What is the expected ratio of offspring with bumpy fruit to offspring with smooth fruit? 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 bumpy fruit or smooth fruit, consider whether each phenotype is the dominant or recessive allele's version of the fruit texture trait. The question tells you that the F allele, which is for bumpy fruit, is dominant over the f allele, which is for smooth fruit. Bumpy fruit is the dominant allele's version of the fruit texture trait. A cucumber plant with the dominant version of the fruit texture trait must have at least one dominant allele for the fruit texture gene. So, offspring with bumpy fruit must have the genotype FF or Ff. There are 0 boxes in the Punnett square with the genotype FF or Ff. Smooth fruit is the recessive allele's version of the fruit texture trait. A cucumber plant with the recessive version of the fruit texture trait must have only recessive alleles for the fruit texture gene. So, offspring with smooth fruit must have the genotype ff. All 4 boxes in the Punnett square have the genotype ff. So, the expected ratio of offspring with bumpy fruit to offspring with smooth fruit is 0:4. This means that, based on the Punnett square, this cross will never produce offspring with bumpy fruit. Instead, this cross is expected to always produce offspring with smooth fruit.

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 bumpy fruit or smooth fruit, consider whether each phenotype is the dominant or recessive allele's version of the fruit texture trait. The question tells you that the F allele, which is for bumpy fruit, is dominant over the f allele, which is for smooth fruit. Bumpy fruit is the dominant allele's version of the fruit texture trait. A cucumber plant with the dominant version of the fruit texture trait must have at least one dominant allele for the fruit texture gene. So, offspring with bumpy fruit must have the genotype FF or Ff. There are 0 boxes in the Punnett square with the genotype FF or Ff. Smooth fruit is the recessive allele's version of the fruit texture trait. A cucumber plant with the recessive version of the fruit texture trait must have only recessive alleles for the fruit texture gene. So, offspring with smooth fruit must have the genotype ff. All 4 boxes in the Punnett square have the genotype ff. So, the expected ratio of offspring with bumpy fruit to offspring with smooth fruit is 0:4. This means that, based on the Punnett square, this cross will never produce offspring with bumpy fruit. Instead, this cross is expected to always produce offspring with smooth fruit.

0:4

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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. Kansas 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. Kansas is farthest north.

Kansas

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Does Fromia monilis have cells that have a nucleus?

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

Fromia monilis is an animal. Animal cells have a nucleus.

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 Fromia monilis is an animal. Animal cells have a nucleus.

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 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger 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 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 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger in Pair 1 than in Pair 2.

The magnetic force is stronger in Pair 1.

01d9bb31bbda498fad53ec6ed9655310

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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

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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. Alabama 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. Alabama is farthest south.

Alabama

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Select the chemical formula for this molecule.

natural science

Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together. Scientists use both ball-and-stick models and chemical formulas to represent molecules. A ball-and-stick model of a molecule is shown below. The balls represent atoms. The sticks represent the chemical bonds between the atoms. Balls that are different colors represent atoms of different elements. The element that each color represents is shown in the legend. Every element has its own abbreviation, called its atomic symbol. Every chemical element is represented by its own symbol. For some elements, that symbol is one capital letter. For other elements, it is one capital letter followed by one lowercase letter. For example, the symbol for the element boron is B and the symbol for the element chlorine is Cl. The molecule shown above has one boron atom and three chlorine atoms. A chemical bond links each chlorine atom to the boron atom. The chemical formula for a substance contains the atomic symbol for each element in the substance. Many chemical formulas also contain subscripts. A subscript is small text placed lower than the normal line of text. Each subscript in a chemical formula is placed after the symbol for an element and tells you how many atoms of that element that symbol represents. If there is no subscript after a symbol, that symbol represents one atom. So, the chemical formula for a substance tells you which elements make up that substance. It also tells you the ratio of the atoms of those elements in the substance. For example, the chemical formula below tells you that there are three chlorine atoms for every one boron atom in the substance. This chemical formula represents the same substance as the ball-and-stick model shown above.

N is the symbol for nitrogen. According to the legend, nitrogen atoms are shown in blue. H is the symbol for hydrogen. According to the legend, hydrogen atoms are shown in light gray. This ball-and-stick model shows a molecule with one nitrogen atom and three hydrogen atoms. The chemical formula will contain the symbols N and H. There is one nitrogen atom, so N will not have a subscript. There are three hydrogen atoms, so H will have a subscript of 3. The correct formula is NH3. The diagram below shows how each part of the chemical formula matches with each part of the model above.

Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together. Scientists use both ball-and-stick models and chemical formulas to represent molecules. A ball-and-stick model of a molecule is shown below. The balls represent atoms. The sticks represent the chemical bonds between the atoms. Balls that are different colors represent atoms of different elements. The element that each color represents is shown in the legend. Every element has its own abbreviation, called its atomic symbol. Every chemical element is represented by its own symbol. For some elements, that symbol is one capital letter. For other elements, it is one capital letter followed by one lowercase letter. For example, the symbol for the element boron is B and the symbol for the element chlorine is Cl. The molecule shown above has one boron atom and three chlorine atoms. A chemical bond links each chlorine atom to the boron atom. The chemical formula for a substance contains the atomic symbol for each element in the substance. Many chemical formulas also contain subscripts. A subscript is small text placed lower than the normal line of text. Each subscript in a chemical formula is placed after the symbol for an element and tells you how many atoms of that element that symbol represents. If there is no subscript after a symbol, that symbol represents one atom. So, the chemical formula for a substance tells you which elements make up that substance. It also tells you the ratio of the atoms of those elements in the substance. For example, the chemical formula below tells you that there are three chlorine atoms for every one boron atom in the substance. This chemical formula represents the same substance as the ball-and-stick model shown above. N is the symbol for nitrogen. According to the legend, nitrogen atoms are shown in blue. H is the symbol for hydrogen. According to the legend, hydrogen atoms are shown in light gray. This ball-and-stick model shows a molecule with one nitrogen atom and three hydrogen atoms. The chemical formula will contain the symbols N and H. There is one nitrogen atom, so N will not have a subscript. There are three hydrogen atoms, so H will have a subscript of 3. The correct formula is NH3. The diagram below shows how each part of the chemical formula matches with each part of the model above.

NH3

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What is the direction of this push?

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 mini golfer pushes the ball away from the putter. The ball rolls into the hole. The direction of the push is away from the mini golfer's putter.

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 mini golfer pushes the ball away from the putter. The ball rolls into the hole. The direction of the push is away from the mini golfer's putter.

away from the mini golfer's putter

8ea313ea99374d47a8aea29ce50b1e67

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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.

312866975e1e4a579fd46e2faabb593e

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Based on the continuum scale, who is meaner than Rumpelstiltskin?

language science

A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another. When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doing this can help you think about the ideas in the text and easily review them. When you write, you can use graphic organizers to organize your thoughts and plan your writing.

A continuum scale compares things by ordering them along a line. This continuum scale shows some famous characters from folktales. Nicer characters are shown to the left. Meaner characters are shown to the right. The Big Bad Wolf is shown to the right of Rumpelstiltskin. This tells you that the Big Bad Wolf is meaner than Rumpelstiltskin.

A graphic organizer is a chart or picture that shows how ideas, facts, or topics are related to one another. When you read, look for graphic organizers included in the text. You can use these images to find key information. You can also create your own graphic organizers with information that you've read. Doing this can help you think about the ideas in the text and easily review them. When you write, you can use graphic organizers to organize your thoughts and plan your writing. A continuum scale compares things by ordering them along a line. This continuum scale shows some famous characters from folktales. Nicer characters are shown to the left. Meaner characters are shown to the right. The Big Bad Wolf is shown to the right of Rumpelstiltskin. This tells you that the Big Bad Wolf is meaner than Rumpelstiltskin.

the Big Bad Wolf

4d4e6d560d02439baf2649ff14fb247c

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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.

01f16625956344dbb5a510b292f9b47d

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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. 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 Chicago, look at the graph. Choice "Jan" is incorrect. Choice "Feb" 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 "Dec" is incorrect. Choice "December, January, and February" is incorrect. The average precipitation for these three months is different. The average precipitation in December is just over 2 inches. But, the average precipitation in January and February is just under 2 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. 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.

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 Chicago, look at the graph. Choice "Jan" is incorrect. Choice "Feb" 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 "Dec" is incorrect. Choice "December, January, and February" is incorrect. The average precipitation for these three months is different. The average precipitation in December is just over 2 inches. But, the average precipitation in January and February is just under 2 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. 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.

September, October, and November

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Which animal's legs are also adapted for wading?

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 shoebill. Long legs help the shoebill keep its body above the surface of the water while wading. Thin legs are easier to move through the water. Now look at each animal. Figure out which animal has a similar adaptation. The little bittern has long, thin legs. Its legs are adapted for wading. The African fish eagle has short legs. Its legs are not adapted for wading. The African fish eagle uses its legs to walk and perch.

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 shoebill. Long legs help the shoebill keep its body above the surface of the water while wading. Thin legs are easier to move through the water. Now look at each animal. Figure out which animal has a similar adaptation. The little bittern has long, thin legs. Its legs are adapted for wading. The African fish eagle has short legs. Its legs are not adapted for wading. The African fish eagle uses its legs to walk and perch.

little bittern

941f704153a74364816c70f8f1e32ae0

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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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Select the organism in the same species as the Goliath heron.

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 Goliath heron's scientific name is Ardea goliath. Falco tinnunculus does not have the same scientific name as a Goliath heron. So, Ardea goliath and Falco tinnunculus are not in the same species. Ardea goliath has the same scientific name as a Goliath heron. So, these organisms are in the same species. Strix uralensis does not have the same scientific name as a Goliath heron. So, Ardea goliath and Strix uralensis 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 Goliath heron's scientific name is Ardea goliath. Falco tinnunculus does not have the same scientific name as a Goliath heron. So, Ardea goliath and Falco tinnunculus are not in the same species. Ardea goliath has the same scientific name as a Goliath heron. So, these organisms are in the same species. Strix uralensis does not have the same scientific name as a Goliath heron. So, Ardea goliath and Strix uralensis are not in the same species.

Ardea goliath

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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 sticky object can attach or stick to other things. All four objects are sticky. A lemon has a sour taste. The honey is not sour. A slippery object is hard to hold onto or stand on. The honey and the tape are not slippery. The property that all four objects have in common is sticky.

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 sticky object can attach or stick to other things. All four objects are sticky. A lemon has a sour taste. The honey is not sour. A slippery object is hard to hold onto or stand on. The honey and the tape are not slippery. The property that all four objects have in common is sticky.

sticky

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Select the bird 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 Surinam horned 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. An Amazon tree boa is a reptile. It has scaly, waterproof skin. Tree boas eat small mammals, birds, lizards, and frogs. Tree boas only need to eat once every few months! A great white shark is a fish. It lives underwater. It has fins, not limbs. Great white sharks can live for up to 70 years. A snowy owl is a bird. It has feathers, two wings, and a beak. Snowy owls live in cold places. Even their feet have feathers to keep warm!

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 Surinam horned 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. An Amazon tree boa is a reptile. It has scaly, waterproof skin. Tree boas eat small mammals, birds, lizards, and frogs. Tree boas only need to eat once every few months! A great white shark is a fish. It lives underwater. It has fins, not limbs. Great white sharks can live for up to 70 years. A snowy owl is a bird. It has feathers, two wings, and a beak. Snowy owls live in cold places. Even their feet have feathers to keep warm!

snowy owl

bac8c1ae98bc4886a1e2b74eb6bc24eb

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Which month is the wettest on average in Cairo?

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 Cairo, look at the graph. Choice "Jan" is incorrect. Choice "Jul" is incorrect. Choice "Sep" is incorrect. January has an average monthly precipitation of about 15 millimeters. This is higher than in any other month. So, January is the wettest month on average.

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 Cairo, look at the graph. Choice "Jan" is incorrect. Choice "Jul" is incorrect. Choice "Sep" is incorrect. January has an average monthly precipitation of about 15 millimeters. This is higher than in any other month. So, January is the wettest month on average.

January

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Which month is the coldest on average in Tokyo?

natural science

Scientists record climate data from places around the world. Temperature is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average temperature for each month. The average temperature can be used to describe the climate of a location. A line graph can be used to show the average temperature each month. Months with higher dots on the graph have higher average temperatures.

To describe the average temperature trends in Tokyo, look at the graph. Choice "Feb" is incorrect. Choice "Aug" is incorrect. Choice "Sep" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "Jan" is incorrect. The average temperatures in January and February are around 5°C. These months have the lowest average temperatures of all of the months. So, they are the coldest months of the year.

Scientists record climate data from places around the world. Temperature is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average temperature for each month. The average temperature can be used to describe the climate of a location. A line graph can be used to show the average temperature each month. Months with higher dots on the graph have higher average temperatures. To describe the average temperature trends in Tokyo, look at the graph. Choice "Feb" is incorrect. Choice "Aug" is incorrect. Choice "Sep" is incorrect. Choice "Oct" is incorrect. Choice "Nov" is incorrect. Choice "Jan" is incorrect. The average temperatures in January and February are around 5°C. These months have the lowest average temperatures of all of the months. So, they are the coldest months of the year.

January and February

2c2f4a890cb04af3969667b797235f1e

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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. South Dakota 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. South Dakota is farthest north.

South Dakota

397206b6a5bd4010a804ff9267391322

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Select the organism in the same genus as the bald eagle.

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 bald eagle's scientific name is Haliaeetus leucocephalus. The first word of its scientific name is Haliaeetus. Strix varia is in the genus Strix. The first word of its scientific name is Strix. So, Strix varia and Haliaeetus leucocephalus are not in the same genus. Falco tinnunculus is in the genus Falco. The first word of its scientific name is Falco. So, Falco tinnunculus and Haliaeetus leucocephalus are not in the same genus. Haliaeetus pelagicus is in the genus Haliaeetus. The first word of its scientific name is Haliaeetus. So, Haliaeetus pelagicus and Haliaeetus leucocephalus 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 bald eagle's scientific name is Haliaeetus leucocephalus. The first word of its scientific name is Haliaeetus. Strix varia is in the genus Strix. The first word of its scientific name is Strix. So, Strix varia and Haliaeetus leucocephalus are not in the same genus. Falco tinnunculus is in the genus Falco. The first word of its scientific name is Falco. So, Falco tinnunculus and Haliaeetus leucocephalus are not in the same genus. Haliaeetus pelagicus is in the genus Haliaeetus. The first word of its scientific name is Haliaeetus. So, Haliaeetus pelagicus and Haliaeetus leucocephalus are in the same genus.

Haliaeetus pelagicus

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Which better describes the Gran Sabana 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 Gran Sabana has a rainy season and a dry season. 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 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 Gran Sabana has a rainy season and a dry season. It also has soil that is poor in nutrients.

It has a rainy season and a dry season. It also has soil that is poor in nutrients.

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Which three months have over 200millimeters of precipitation in Singapore?

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 Singapore, look at the graph. Choice "Jan" 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 "Dec" is incorrect. November, December, and January each have over 200 millimeters of precipitation.

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 Singapore, look at the graph. Choice "Jan" 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 "Dec" is incorrect. November, December, and January each have over 200 millimeters of precipitation.

November, December, and January

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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 Australia.

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

Australia

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Does Nembrotha megalocera have cells that have a nucleus?

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. Animal cells have a nucleus.

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. Animal cells have a nucleus.

yes

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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: 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 north pole of the other magnet. Like poles 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: 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 north pole of the other magnet. Like poles repel. So, these magnets will repel each other.

repel

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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 A has more purple particles per milliliter. So, Solution A 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 A has more purple particles per milliliter. So, Solution A has a higher concentration of purple particles.

Solution A

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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. Colorado 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. Colorado is farthest west.

Colorado

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Which of the following fossils is older? 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 older: The crocodile egg fossil is in a deeper layer in the rock sequence than the palm leaf fossil. So, the crocodile egg fossil is most likely older than the palm leaf 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 older: The crocodile egg fossil is in a deeper layer in the rock sequence than the palm leaf fossil. So, the crocodile egg fossil is most likely older than the palm leaf fossil.

crocodile egg

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Which animal's mouth is also adapted for bottom feeding?

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 mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear through meat. A long, thin mouth might help an animal catch insects that live in holes. Animals that eat similar food often have similar mouths.

Look at the picture of the leopard shark. The leopard shark's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding. The leopard shark uses its mouth to find food hidden in the sediment of the ocean floor. Now look at each animal. Figure out which animal has a similar adaptation. The sturgeon's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding. The orangespine unicornfish's mouth is not located on the underside of its head. Its mouth is not adapted for bottom feeding.

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 mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear through meat. A long, thin mouth might help an animal catch insects that live in holes. Animals that eat similar food often have similar mouths. Look at the picture of the leopard shark. The leopard shark's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding. The leopard shark uses its mouth to find food hidden in the sediment of the ocean floor. Now look at each animal. Figure out which animal has a similar adaptation. The sturgeon's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding. The orangespine unicornfish's mouth is not located on the underside of its head. Its mouth is not adapted for bottom feeding.

sturgeon

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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. California 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. California is farthest south.

California

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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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Which bird's beak is also adapted to filter through mud?

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 Canada goose. The Canada goose has a wide, flat beak. Its beak is adapted to filter through mud. The Canada goose gathers muddy water in its beak. Then, it pushes the water out through gaps along the sides of the beak. Bits of food, such as plant roots, are left behind inside the goose's beak. Now look at each bird. Figure out which bird has a similar adaptation. The black swan has a wide, flat beak. Its beak is adapted to filter through mud. The Eurasian eagle-owl has a short hooked beak. Its beak is not adapted to filter through mud. The Eurasian eagle-owl uses its beak 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 Canada goose. The Canada goose has a wide, flat beak. Its beak is adapted to filter through mud. The Canada goose gathers muddy water in its beak. Then, it pushes the water out through gaps along the sides of the beak. Bits of food, such as plant roots, are left behind inside the goose's beak. Now look at each bird. Figure out which bird has a similar adaptation. The black swan has a wide, flat beak. Its beak is adapted to filter through mud. The Eurasian eagle-owl has a short hooked beak. Its beak is not adapted to filter through mud. The Eurasian eagle-owl uses its beak to tear through meat.

black swan

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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 bouncy object will bounce back from the floor if you drop it. The soccer ball is bouncy. Blue is a color. This color is blue. The soccer ball is not blue.

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 bouncy object will bounce back from the floor if you drop it. The soccer ball is bouncy. Blue is a color. This color is blue. The soccer ball is not blue.

bouncy

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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 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker 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 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 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1.

The magnetic force is weaker in Pair 2.

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Is the following statement about our solar system true or false? The largest planet is made mainly of ice.

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.

The table tells you that Jupiter is the largest planet and that Jupiter is made mainly of gas. So, the largest planet is made mainly of gas.

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. The table tells you that Jupiter is the largest planet and that Jupiter is made mainly of gas. So, the largest planet is made mainly of gas.

false

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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 Cape vulture. The Cape vulture has large, powerful wings. It is adapted for flight. Long, powerful wings help the Cape vulture travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The great blue heron 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 Cape vulture. The Cape vulture has large, powerful wings. It is adapted for flight. Long, powerful wings help the Cape vulture travel long distances by air. Now look at each animal. Figure out which animal has a similar adaptation. The great blue heron 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.

great blue heron

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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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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. An opaque object does not let light through. The pretzel, the cracker, and the fries are opaque, but the ocean water is not. A flexible object can be folded or bent without breaking easily. The fries are flexible, but the cracker is not. Potato chips have a salty taste. All four objects are salty. The property that all four objects have in common is salty.

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. An opaque object does not let light through. The pretzel, the cracker, and the fries are opaque, but the ocean water is not. A flexible object can be folded or bent without breaking easily. The fries are flexible, but the cracker is not. Potato chips have a salty taste. All four objects are salty. The property that all four objects have in common is salty.

salty

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What is the expected ratio of offspring with straight fur to offspring with curly fur? 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 straight fur or curly fur, consider whether each phenotype is the dominant or recessive allele's version of the fur type trait. The question tells you that the f allele, which is for curly fur, is recessive to the F allele, which is for straight fur. Straight fur is the dominant allele's version of the fur type trait. A cat with the dominant version of the fur type trait must have at least one dominant allele for the fur type gene. So, offspring with straight fur must have the genotype FF or Ff. All 4 boxes in the Punnett square have the genotype FF or Ff. Curly fur is the recessive allele's version of the fur type trait. A cat with the recessive version of the fur type trait must have only recessive alleles for the fur type gene. So, offspring with curly fur must have the genotype ff. There are 0 boxes in the Punnett square with the genotype ff. So, the expected ratio of offspring with straight fur to offspring with curly fur is 4:0. This means that, based on the Punnett square, this cross will always produce offspring with straight fur. This cross is expected to never produce offspring with curly fur.

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 straight fur or curly fur, consider whether each phenotype is the dominant or recessive allele's version of the fur type trait. The question tells you that the f allele, which is for curly fur, is recessive to the F allele, which is for straight fur. Straight fur is the dominant allele's version of the fur type trait. A cat with the dominant version of the fur type trait must have at least one dominant allele for the fur type gene. So, offspring with straight fur must have the genotype FF or Ff. All 4 boxes in the Punnett square have the genotype FF or Ff. Curly fur is the recessive allele's version of the fur type trait. A cat with the recessive version of the fur type trait must have only recessive alleles for the fur type gene. So, offspring with curly fur must have the genotype ff. There are 0 boxes in the Punnett square with the genotype ff. So, the expected ratio of offspring with straight fur to offspring with curly fur is 4:0. This means that, based on the Punnett square, this cross will always produce offspring with straight fur. This cross is expected to never produce offspring with curly fur.

4:0

80615278721d4159ba6ce8c790f05006

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Select the mammal 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 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 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!

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 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 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!

black howler

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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.

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 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. 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 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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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 north pole of one 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. The north pole of one 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 the following statement about our solar system true or false? 75% of the planets are made mainly of rock.

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.

The table tells you that four out of the eight planets are made mainly of rock. So, one-half, or 50%, of the planets are made mainly of rock.

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. The table tells you that four out of the eight planets are made mainly of rock. So, one-half, or 50%, of the planets are made mainly of rock.

false

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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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Which better describes the Sonoran Desert 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 hot desert is a type of ecosystem. Hot deserts have the following features: a small amount of rain, dry, thin soil, and many different types of organisms. So, the Sonoran Desert has a small amount of rain. It also has many different types of organisms.

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 hot desert is a type of ecosystem. Hot deserts have the following features: a small amount of rain, dry, thin soil, and many different types of organisms. So, the Sonoran Desert has a small amount of rain. It also has many different types of organisms.

It has a small amount of rain. It also has many different types of organisms.

7359b958c21e41b597dfefd1be29e9c1

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Look at the picture. Which word best describes how this feather feels to the touch?

language science

When you write, you can use sensory details. These sense words help your reader understand what something looks, sounds, tastes, smells, or feels like. Sensory Category | Description Sight | These are words like bright, clean, and purple. A reader can imagine looking at these details. Sound | These are words like hissing, buzzing, and ringing. A reader can imagine hearing these details. Taste | These are words like juicy, sweet, and burnt. A reader can imagine tasting these details. Smell | These are words like fruity, sweet, and stinky. A reader can imagine smelling these details. Touch | These are words like fuzzy, wet, and soft. A reader can imagine feeling these details. Many sense words can describe more than one sense. For example, soft can describe a touch or a sound. And sweet can describe a taste or a smell.

Look at the picture. The word soft describes how this feather feels to the touch. Heavy and bumpy can also describe how something feels to the touch. But they do not describe this feather.

When you write, you can use sensory details. These sense words help your reader understand what something looks, sounds, tastes, smells, or feels like. Sensory Category | Description Sight | These are words like bright, clean, and purple. A reader can imagine looking at these details. Sound | These are words like hissing, buzzing, and ringing. A reader can imagine hearing these details. Taste | These are words like juicy, sweet, and burnt. A reader can imagine tasting these details. Smell | These are words like fruity, sweet, and stinky. A reader can imagine smelling these details. Touch | These are words like fuzzy, wet, and soft. A reader can imagine feeling these details. Many sense words can describe more than one sense. For example, soft can describe a touch or a sound. And sweet can describe a taste or a smell. Look at the picture. The word soft describes how this feather feels to the touch. Heavy and bumpy can also describe how something feels to the touch. But they do not describe this feather.

soft

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Which part of the bamboo plant do we usually eat?

natural science

The fruits and vegetables we eat are parts of plants! Plants are made up of different structures. The different structures carry out important functions. The roots take in water and nutrients from the soil. They also hold the plant in place in the soil. The stem supports the plant. It carries food, water, and nutrients through the plant. The leaves are where most of the plant's photosynthesis happens. Photosynthesis is the process plants use to turn water, sunlight, and carbon dioxide into food. After they are pollinated, the flowers make seeds and fruit. The fruit contain the seeds. Each fruit grows from a pollinated flower. The seeds can grow into a new plant. Germination is when a seed begins to grow.

The part of the bamboo plant we usually eat is the stem. It supports the plant. It also carries food, water, and nutrients through the plant.

The fruits and vegetables we eat are parts of plants! Plants are made up of different structures. The different structures carry out important functions. The roots take in water and nutrients from the soil. They also hold the plant in place in the soil. The stem supports the plant. It carries food, water, and nutrients through the plant. The leaves are where most of the plant's photosynthesis happens. Photosynthesis is the process plants use to turn water, sunlight, and carbon dioxide into food. After they are pollinated, the flowers make seeds and fruit. The fruit contain the seeds. Each fruit grows from a pollinated flower. The seeds can grow into a new plant. Germination is when a seed begins to grow. The part of the bamboo plant we usually eat is the stem. It supports the plant. It also carries food, water, and nutrients through the plant.

the stem

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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 sample B has more mass than each particle in sample A. The particles in sample B also have a higher average speed than the particles 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. Each particle in sample B has more mass than each particle in sample A. The particles in sample B also have a higher average speed than the particles 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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Select the organism in the same species as the bald eagle.

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 bald eagle's scientific name is Haliaeetus leucocephalus. Pelecanus occidentalis does not have the same scientific name as a bald eagle. So, Haliaeetus leucocephalus and Pelecanus occidentalis are not in the same species. Haliaeetus leucocephalus has the same scientific name as a bald eagle. So, these organisms are in the same species. Bubo scandiacus does not have the same scientific name as a bald eagle. So, Haliaeetus leucocephalus and Bubo scandiacus 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 bald eagle's scientific name is Haliaeetus leucocephalus. Pelecanus occidentalis does not have the same scientific name as a bald eagle. So, Haliaeetus leucocephalus and Pelecanus occidentalis are not in the same species. Haliaeetus leucocephalus has the same scientific name as a bald eagle. So, these organisms are in the same species. Bubo scandiacus does not have the same scientific name as a bald eagle. So, Haliaeetus leucocephalus and Bubo scandiacus are not in the same species.

Haliaeetus leucocephalus

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Complete the statement. Silver bromide 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 fluorine is F, and the atomic symbol for the chemical element beryllium is Be. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a space-filling model. The space-filling model below represents the compound potassium chloride. In a space-filling model, the balls represent atoms that are bonded together. 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 silver bromide 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 silver bromide is composed of bromine atoms and silver atoms bonded together. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that silver bromide is composed of two chemical elements: bromine and silver. Since silver bromide is composed of multiple chemical elements bonded together, silver bromide 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 fluorine is F, and the atomic symbol for the chemical element beryllium is Be. Scientists use different types of models to represent substances whose atoms are bonded in different ways. One type of model is a space-filling model. The space-filling model below represents the compound potassium chloride. In a space-filling model, the balls represent atoms that are bonded together. 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 silver bromide 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 silver bromide is composed of bromine atoms and silver atoms bonded together. Step 2: Determine whether the substance is an elementary substance or a compound. You know from Step 1 that silver bromide is composed of two chemical elements: bromine and silver. Since silver bromide is composed of multiple chemical elements bonded together, silver bromide is a compound.

a compound

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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. Kansas 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. Kansas is farthest west.

Kansas

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Is rain 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 shape of its own. Some solids can be bent or broken easily. Others are hard to bend or break. A glass cup is a solid. A sock is also a solid. When matter is a liquid, it takes the shape of its container. Think about pouring a liquid from a cup into a bottle. The shape of the liquid is different in the cup than in the bottle. But the liquid still takes up the same amount of space. Juice is a liquid. Honey is also a liquid. When matter is a gas, it spreads out to fill a space. Many gases are invisible. So, you can’t see them. Air is a gas.

Rain is a liquid. A liquid takes the shape of any container it is in. If you put rainwater into a bucket, the rainwater will take the shape of the bucket. But the rainwater 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 shape of its own. Some solids can be bent or broken easily. Others are hard to bend or break. A glass cup is a solid. A sock is also a solid. When matter is a liquid, it takes the shape of its container. Think about pouring a liquid from a cup into a bottle. The shape of the liquid is different in the cup than in the bottle. But the liquid still takes up the same amount of space. Juice is a liquid. Honey is also a liquid. When matter is a gas, it spreads out to fill a space. Many gases are invisible. So, you can’t see them. Air is a gas. Rain is a liquid. A liquid takes the shape of any container it is in. If you put rainwater into a bucket, the rainwater will take the shape of the bucket. But the rainwater will still take up the same amount of space.

a liquid

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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 Australia.

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

Australia

1b421d6797be4edca2cdce3157458337

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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 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker 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 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 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1.

The magnetic force is weaker in Pair 2.

094e9c8081474f1baf38f59a27f8b6f1

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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.

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 1 than in Pair 2. So, the magnitude of the magnetic force is smaller 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 smaller when the magnets are smaller. 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 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2.

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

3996714a22344c22ae6688c2e5c9badf

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Which type of force from the baby's hand opens the cabinet door?

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 baby's hand applies a force to the cabinet door. This force causes the door to open. The direction of this force is toward the baby's hand. 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 baby's hand applies a force to the cabinet door. This force causes the door to open. The direction of this force is toward the baby's hand. This force is a pull.

pull

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

Solution A

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Select the organism in the same genus as the purple heron.

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 purple heron's scientific name is Ardea purpurea. The first word of its scientific name is Ardea. Sarracenia purpurea and Ardea purpurea are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Sarracenia purpurea and Ardea purpurea have the same species name within their genus, purpurea. But the first words of their scientific names are different. Sarracenia purpurea is in the genus Sarracenia, and Ardea purpurea is in the genus Ardea. Ardea cocoi is in the genus Ardea. The first word of its scientific name is Ardea. So, Ardea cocoi and Ardea purpurea are in the same genus. Lynx pardinus is in the genus Lynx. The first word of its scientific name is Lynx. So, Lynx pardinus and Ardea purpurea are not 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 purple heron's scientific name is Ardea purpurea. The first word of its scientific name is Ardea. Sarracenia purpurea and Ardea purpurea are not in the same genus. These organisms are not in the same genus, but part of their scientific names is the same. Sarracenia purpurea and Ardea purpurea have the same species name within their genus, purpurea. But the first words of their scientific names are different. Sarracenia purpurea is in the genus Sarracenia, and Ardea purpurea is in the genus Ardea. Ardea cocoi is in the genus Ardea. The first word of its scientific name is Ardea. So, Ardea cocoi and Ardea purpurea are in the same genus. Lynx pardinus is in the genus Lynx. The first word of its scientific name is Lynx. So, Lynx pardinus and Ardea purpurea are not in the same genus.

Ardea cocoi

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Which is this organism's common 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.

Buteo jamaicensis is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name. Buteo jamaicensis is the organism's scientific name. So, you know that red-tailed hawk is the common 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. Buteo jamaicensis is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name. Buteo jamaicensis is the organism's scientific name. So, you know that red-tailed hawk is the common name.

red-tailed hawk

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Which of the following organisms is the primary 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.

Primary consumers eat producers. So, in a food web, primary consumers have arrows pointing to them from producers. The black bear has an arrow pointing to it from the persimmon tree. The persimmon tree is a producer, so the black bear is a primary consumer. The beaver has an arrow pointing to it from the silver maple. The silver maple is a producer, so the beaver is a primary consumer. The persimmon tree does not have any arrows pointing to it. So, the persimmon tree is not a primary consumer. The silver maple does not have any arrows pointing to it. So, the silver maple is not a primary consumer. The gray fox has arrows pointing to it from the swallowtail caterpillar and the pine vole. Neither the swallowtail caterpillar nor the pine vole is a producer, so the gray fox is not a primary 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. Primary consumers eat producers. So, in a food web, primary consumers have arrows pointing to them from producers. The black bear has an arrow pointing to it from the persimmon tree. The persimmon tree is a producer, so the black bear is a primary consumer. The beaver has an arrow pointing to it from the silver maple. The silver maple is a producer, so the beaver is a primary consumer. The persimmon tree does not have any arrows pointing to it. So, the persimmon tree is not a primary consumer. The silver maple does not have any arrows pointing to it. So, the silver maple is not a primary consumer. The gray fox has arrows pointing to it from the swallowtail caterpillar and the pine vole. Neither the swallowtail caterpillar nor the pine vole is a producer, so the gray fox is not a primary consumer.

beaver

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Select the bird 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 pelican is a bird. It has feathers, two wings, and a beak. Brown pelicans live near water. They can dive underwater to catch fish. A golden 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.

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 pelican is a bird. It has feathers, two wings, and a beak. Brown pelicans live near water. They can dive underwater to catch fish. A golden 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.

pelican

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

Solution A

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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 soft object changes shape when you squeeze it. The window is not soft. A hard object keeps its shape when you squeeze it. The window is hard.

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 soft object changes shape when you squeeze it. The window is not soft. A hard object keeps its shape when you squeeze it. The window is hard.

hard

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Which is this organism's common 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.

Haliaeetus leucocephalus is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name. Haliaeetus leucocephalus is the organism's scientific name. So, you know that bald eagle is the common 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. Haliaeetus leucocephalus is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name. Haliaeetus leucocephalus is the organism's scientific name. So, you know that bald eagle is the common name.

bald eagle

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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 of these states is farthest east?

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 east arrow is pointing. Vermont is farthest east.

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 east arrow is pointing. Vermont is farthest east.

Vermont

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Select the organism in the same genus as the Canada lynx.

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 Canada lynx's scientific name is Lynx canadensis. The first word of its scientific name is Lynx. Lynx rufus is in the genus Lynx. The first word of its scientific name is Lynx. So, Lynx rufus and Lynx canadensis are in the same genus. Felis chaus is in the genus Felis. The first word of its scientific name is Felis. So, Felis chaus and Lynx canadensis are not in the same genus. Felis catus is in the genus Felis. The first word of its scientific name is Felis. So, Felis catus and Lynx canadensis are not 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 Canada lynx's scientific name is Lynx canadensis. The first word of its scientific name is Lynx. Lynx rufus is in the genus Lynx. The first word of its scientific name is Lynx. So, Lynx rufus and Lynx canadensis are in the same genus. Felis chaus is in the genus Felis. The first word of its scientific name is Felis. So, Felis chaus and Lynx canadensis are not in the same genus. Felis catus is in the genus Felis. The first word of its scientific name is Felis. So, Felis catus and Lynx canadensis are not in the same genus.

Lynx rufus

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