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Which soil component has the least capacity for holding water? | [
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Two pieces of the same metal are placed on a table. The pieces of metal have the same density, mass, and texture. Which characteristic must be the ONLY difference between the two samples? | [
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Why do areas in the middle of a large continent generally have more extreme differences in temperature than areas near the coastline? | [
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Which is an example of organic weathering of rocks? | [
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A student riding a bicycle observes that it moves faster on a smooth road than on a rough road. This happens because the smooth road has | [
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Which is an advantage of using renewable resources? | [
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Which of the following is an example of a form of energy? | [
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A toy car rolls at a constant speed down a straight inclined track. When the car reaches the flat surface at the base of the inclined track, the speed of the car decreases. Which statement best explains why the speed of the car decreases when it reaches the flat surface? | [
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Students watched a bird fly to and from a large bush every few minutes. The students told their teacher, "The bird has a nest in that bush." This statement is an example of | [
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Which of these is an important safety rule to follow when using an electrical device? | [
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Which situation would be considered observation and measurement? | [
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Corn can be used to make ethanol, which is a fuel for some cars. What problem could be caused by the increased use of ethanol? | [
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As Archie walks to the park, he wonders which route would be faster. He decides to walk to the park using different routes and times how long it takes. Which should he do to make his comparison fair? | [
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In humans, the gene for a free earlobe [E] is dominant over the gene for an attached earlobe [e]. If one parent has a free earlobe [ Ee ] and the other parent has an attached earlobe ( ee ), what is the probability that their offspring will have an attached earlobe? | [
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Which body of water has the fewest plants and animals living in it? | [
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City administrators can encourage energy conservation by | [
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Which of these would most likely improve the air quality in large Texas cities? | [
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A group of students plans to build a model of a local pond habitat. Which model best represents an environment similar to a pond? | [
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A tree frog with which characteristic is more likely to survive than other tree frogs? | [
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A student is given a liquid compound in a beaker. Which of the following is the best way to describe this liquid compound? | [
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Students dropped different rocks into sand to simulate meteorite impacts. Their goal was to determine which rock made the deepest crater. Which variable should the students control in order to have the most accurate results? | [
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Which action most often causes sinkholes to form on the surface of Earth? | [
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Which of the following statements best describes one way that the Moon is different from Earth? | [
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The gametes of human males and females have the same number of chromosomes. Which best describes what happens to the chromosomes when typical male and female gametes combine to produce offspring? | [
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The structures found in a living cell can be compared to the parts of a factory that produces cars. Which part of the factory is most similar to the nucleus of a living cell? | [
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A person is 6 feet tall. Which of the following metric measurements is most near to 6 feet? | [
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What is a worldwide increase in temperature called? | [
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The weathering of landforms depends on various factors. Which area would most likely have the fastest rate of chemical weathering? | [
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Which property best indicates that soil contains nutrients? | [
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Ice water is poured into four cups made of different materials. The cup made of which material will be the coldest to touch after one minute? | [
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Sound waves travel fastest in | [
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Why are different stars seen during different seasons? | [
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Which statement describes how muscles work to allow a person to extend an arm from a curled position by straightening the elbow? | [
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Which organ in a frog has a function similar to the function of lungs in a bird? | [
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Which food is a fruit? | [
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A handheld sewing machine uses a battery to make a needle move. The needle goes up and down quickly. Which energy change is taking place? | [
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Why is it winter in North America when it is summer in South America? | [
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Coal and trees are resources found in Maryland. Both resources are used for | [
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Oscar is investigating how many days it takes for a chick to hatch from an egg. Which number of eggs would give Oscar the most reliable results? | [
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Which is the best example a chemical change has occurred? | [
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What is the primary source of energy that causes evaporation of water from the surface of bodies of water? | [
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Steel cans are separated from aluminum cans in a recycling center. Which of the following is the best way the recycling center can separate the steel cans from the aluminum cans? | [
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Casey has found several identical marine animals attached to an artificial reef in the Gulf of Mexico. Which characteristic would identify the animals as mollusks? | [
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An air mass in a valley travels up a mountainside. What causes the movement of this air? | [
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A pharmaceutical company has published the results of a limited experiment investigating the protective value of a chemical compound against high doses of UV rays on skin cells. It was later discovered that the results were not reproducible. What action could the company researchers have taken to avoid publishing erroneous results? | [
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A student investigated the percentage of energy obtained from several food sources for a population of eagles. Which format is the best way to display this data? | [
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The source of energy for the Earth's water cycle is the | [
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A female opossum can give birth to 5-15 offspring. What increases with a larger litter? | [
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A group of Canada geese left a Florida lake in the spring. The geese arrived at a Maine lake 2,000 km away in 40 days. If the geese traveled at a constant rate, how far did the geese travel on the first day? | [
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Louis Pasteur created a process that reduced the amount of bacteria in milk. How does this process most likely benefit people? | [
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In early 2003, the Human Genome Project identified the sequence of base pairs in the genes in human DNA. With all of this information, many of the functions of the genes are still unknown. Currently, scientists are studying many of these genes in order to learn more about them. What is the significance of this new genetic discovery? | [
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In pea plants, the allele for smooth peas is dominant (S). If a heterozygous smooth pea plant (Ss) is crossed with a homozygous smooth pea plant (SS), which are the possible genotypes the offspring could have? | [
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Currently, Antarctica is the coldest and driest place on Earth. Paleontologists have found dinosaur fossils in rock layers below the ice. Based on this evidence, which is a reasonable conclusion about the climate of Antarctica in the past? | [
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When a car engine is started, gasoline is mixed with air and burned. Heat, sound, and chemical products are released. As the engine operates, which of these remains constant? | [
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A student plants rosebushes in her front yard. The student is frequently seen pulling weeds from the base of the rosebushes. What is the most likely reason that the weeds are pulled? | [
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The speed of sound is generally greatest in | [
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A green tree frog lives in a forest. How does the frog's green color help it to survive? | [
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A sound is heard when you pluck a string on a guitar. What will happen to the sound if the same string is plucked harder? | [
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Mercury and gold are both metals. Unlike gold, mercury cannot be used to make jewelry because it is a liquid at room temperature. The difference in the state of matter is an example of which type of property? | [
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Heat transfer is part of everyday life. Which of these examples involving heat transfer occurs mainly by conduction? | [
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The heart, blood vessels, kidneys, and bladder working together are best described as | [
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Which of the following is found farthest from the center of an atom? | [
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Sulfur (S), oxygen (O2), water (H2O), and sodium chloride (NaCl) are all examples of pure substances. Which of the following describes all pure substances? | [
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Swamp plants die, fall to the ground, and are buried by other dying plants. Approximately how long would it take for plants to possibly become a fossil fuel? | [
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A line graph is best used to | [
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Researchers work in teams to make cars more fuel efficient. Which of these statements describes the main advantage of working in teams rather than working individually? | [
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Which best describes sexual reproduction in all animals? | [
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Using the Internet for a research paper can help a student find many resources. One problem with using information on the Internet is that it might be | [
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Which human activity will help decrease air pollution? | [
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Which protist is a bi-flagellate autotroph? | [
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When a compression wave travels through a medium, in what direction is the medium displaced? | [
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A town built a road through a forest. Deer live in the forest on both sides of the road. Which would not help protect deer from the cars on the road? | [
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Which statement is the best description of what happens in the rock cycle? | [
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Uranus is one of the outer planets of the solar system. The average distance of Uranus from the Sun is 2.87 billion kilometers. Which best explains why Uranus revolves in its orbit instead of moving out into space? | [
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An engineer can choose from four different materials to make a heat-resistant handle for a stirring spoon. Which material is least likely to get hot when the spoon is placed in boiling water? | [
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Which would a scientist use in trying to model the cause of planetary years? | [
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Aluminum and copper are composed of different types of matter. Which statement best describes matter? | [
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Which characteristic of the asthenosphere helps explain the evidence of crustal-plate motion? | [
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Mrs. Tucker gives her class samples of different soil types. Which action best helps Tanisha identify each soil type? | [
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Based on their locations in the periodic table, which element has chemical properties most similar to those of calcium, Ca? | [
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At what temperature is water most likely to be in vapor form? | [
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The average rainfall in Nevada is about 7 inches per year. The most likely reason for the low amount of rainfall is the | [
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In multicellular organisms, different structures have different functions. Which function is carried out in the leaves of a plant? | [
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A perpetual motion machine is a theoretical device which, once started, continues to operate without any additional input of energy. Which statement describes why a perpetual motion machine is impossible to design? | [
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When a plant wilts, the stomata close. How does this help the plant? | [
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Some people suffer from a condition called carpal tunnel syndrome that causes pain in the wrists. Carpal tunnel syndrome can result from repetitive actions of the wrists and hands, such as typing on a computer keyboard. This is an example of using technology in spite of its | [
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Two chemicals are mixed together in a beaker that is sitting in an ice water bath. The ice in the water melts as the chemicals react for one minute. What type of reaction is taking place? | [
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A small community is building their first water treatment plant, but has limited amounts of land and money available. One of the council members suggests reducing costs and land needs by leaving out the aeration pond. The plant supervisor explains that aeration is a necessary step in treating drinking water. What is the most important reason the town should include an aeration pond in their water treatment plant? | [
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Rolando wants to see at what temperature various liquids boil. He boils tap water and records the temperature. He then boils tap water with milk added and tap water with sugar added. What is the purpose of boiling plain tap water first? | [
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Why are alternative fuels being used in some automobiles? | [
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Which activity is directly regulated by neurons? | [
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Compared to similar-sized gasoline-powered vehicles, electric-gasoline-hybrid vehicles are primarily designed to | [
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A student leaves a bucket of water outside on a warm, sunny day. Which process most likely happens to the water in the bucket? | [
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Which mechanism is not an example of a negative feedback mechanism in the human body? | [
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In the 17th century, Galileo proposed a hypothesis to explain how suction pumps work. Galileo's hypothesis was disproved, but later it helped Torricelli in the development of an instrument for measuring atmospheric pressure. How did Galileo's hypothesis most likely help with the development of this new technology? | [
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When it rains, some animals will ___. | [
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How many times does Earth rotate on its axis in one day? | [
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When people exercise, they often feel thirsty and begin to sweat. It is important for people to feel thirsty when exercising because it makes them realize that they should | [
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Fraternal twins may or may not share similar characteristics due to | [
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Populations living in one place form a | [
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