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How do coal and the sun compare as sources of energy? | [
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How do scientists know that some mountains were once at the bottom of an ocean? | [
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A cell that is low in water will most likely immediately lose the ability to | [
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When oil and water are mixed together, they form a | [
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What particle always has a mass of one atomic mass unit (amu) and no charge? | [
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A student wants to create a model showing the most important reason why old gasoline should never be poured into the soil. Which of the following must be included in the model? | [
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Daffodils are plants that can perform both asexual and sexual reproduction. How does a daffodil population benefit more by reproducing sexually than asexually? | [
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There are four stages to the life cycle of a butterfly: adult, pupa, egg, and caterpillar. Which of these occurs first? | [
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One effect of ocean pollution is that it can reduce populations of phytoplankton and algae. The reduction of these populations might have which impact on an ecosystem? | [
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The ocean water near the equator absorbs more heat throughout the year than ocean water near the North Pole. Which of the following best explains this difference? | [
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Scientists use models that show the features of an atom. A scientist should use a model that | [
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Which invention would a culture living above the Arctic Circle most likely develop? | [
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What is the main source of heat for Earth's surface? | [
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Which of the following best describes the purpose of the chromosomes in the nucleus of a cell? | [
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In what way can bacteria be good for the human body? | [
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People use water in different ways. Which of these activities wastes water? | [
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Rat snakes, Elaphe obsoleta, are a species made of many distinct populations in different areas. Each of the populations has different markings and colorings. Where would rat snakes most likely be gray? | [
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Which of the following is a similarity 20 between x-ray waves and sound waves? | [
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A medical research team is trying to determine whether a cream that is rubbed on the chest will help reduce the coughing associated with a particular illness. The team conducts the research using several groups of people. Which step will most likely result in producing a dependent (responding) variable that will help validate their research? | [
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Which of these occurs due to the rotation of Earth? | [
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If there is a great deal of precipitation occurring in a short time, which process in the water cycle will be affected first? | [
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What is the source of fuels such as coal and natural gas? | [
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A student is standing on a skateboard that is not moving. The total mass of the student and the skateboard is 50 kilograms. The student throws a ball with a mass of 2 kilograms forward at 5 m/s. Assuming the skateboard wheels are frictionless, how will the student and the skateboard move? | [
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The Late Heavy Bombardment was a period of extensive comet impact on Earth about 3.8 billion years ago. Scientists believe this period provided much of the matter now found in which part of the Earth system? | [
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Which of the following best explains why many species of birds in New England fly south for the winter months? | [
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The force of gravity on an object depends primarily on the object's | [
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A species lives in a region that changes over time from temperate to tropical. The survival of the species will be most probable if the species can do which of the following? | [
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Which plant part is similar to a bird's egg? | [
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When is wood a nonrenewable resource? | [
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Which of these processes can cause layers of rock to be arranged so that the youngest layers are found below older layers? | [
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Which type of water reservoir contains the largest volume of fresh water? | [
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Which of the following does not affect the strength of an electromagnet? | [
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What is the result of cellular respiration? | [
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Which of following is a property shared by the elements in the carbon family? | [
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All of the following are examples of erosion EXCEPT: | [
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When fresh water and salt water meet in an estuary, the salt water typically flows underneath the fresh water because the salt water is denser. What effect does this most likely have on the nutrients concentrated in the fresh water? | [
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A student is shown a slide of cells from a species of producer in a food web. The student observes that the cells have chloroplasts. What conclusion about the food web is best supported by these findings? | [
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Which conclusion should the students make from the information in the table? | [
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One evening as it is getting dark, Alex sits on the front porch and watches the sun slowly disappear behind the neighbor's house across the street. Which explains this observation? | [
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Two students are asked to make a chart on the electromagnetic spectrum. Reading left to right, one student's chart shows the spectrum from gamma rays to radio waves, while the other student's chart shows the opposite. If the teacher says that both charts are correct, then | [
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Students make weather observations outside the school building, and then they record their observations. Which observation should be recorded as a fact? | [
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A change in the density of air can result in a breeze. Which diagram best shows a series of energy transfers that begins with the Sun and results in a breeze? | [
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A college student looks through a microscope at blood cells and states that red blood cells are more important than white blood cells. This statement is a | [
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A car is traveling on a highway at a constant velocity. Which statement best describes the forces acting on the car? | [
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Which describes the role of sexual reproduction in plants and animals? | [
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The radioactive isotope content of a rock can be used to identify which property of the rock? | [
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Some types of medicines can be used to cure people when they are sick. Some medicines, however, may cause bad reactions to the people taking them. This difference is an example of | [
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Researchers recently discovered a gene in humans that previously was unknown to science. Which statement best explains why the gene probably was not discovered much sooner? | [
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A road cut shows a layer of shale on top of a layer of limestone. This indicates | [
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Which condition is associated with most warm fronts? | [
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What do cells break down to produce energy? | [
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If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container? | [
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A chemical property of a mineral is evident if the mineral | [
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Which characteristic of a bird most likely aids in obtaining food found in small places? | [
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Which of these best defines communicable diseases? | [
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An atom includes 8 electrons, 8 protons, and 8 neutrons. What is the mass of the atom? | [
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Which of the following is the farthest from Earth? | [
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Which of these is a function of all cells? | [
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A company is designing a new laptop computer. The computer must not exceed a certain weight. Which of the following is the most likely reason to have a weight restriction for the computer? | [
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Which property of a mineral can be determined just by looking at it? | [
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Examine each of these chemical equations to determine which equation is correctly balanced. | [
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In a tropical rainforest, the difference between daytime and nighttime temperatures is relatively small. In the desert, the difference between daytime and nighttime temperatures is very large. Which factor contributes to the lower variation in rainforest temperatures? | [
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Why are coal, oil, and natural gas called fossil fuels? | [
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Annette is using many tools to build a doghouse. For which of the following would Annette most likely use a tape measure while building the doghouse? | [
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Vegetables can be scientifically classified by all of these except | [
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The liver converts glucose to glycogen for storage. Why is this function considered a chemical change? | [
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Which of these conditions most likely results from infection? | [
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The pull of gravity on Earth is a direct result of the | [
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Which characteristic does a paramecium have in common with volvox? | [
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Which event takes the most time to produce measurable changes? | [
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The movement of an air mass over Earth's surface causes | [
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What is one way plants and animals are different? | [
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Secondary succession is a process that reestablishes a previously colonized, but disturbed or damaged habitat. Which will most likely result in colonization by large herbivores and carnivores? | [
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What precaution must be taken by students when making observations of the Sun? | [
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How are green plants an important part of the carbon dioxide-oxygen cycle? | [
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Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball? | [
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A scientist discovered a fossil of an ocean plant in the rocks of a desert. What does the discovery of this fossil most likely tell the scientist? | [
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One important difference between living things and nonliving things is that only living things have | [
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When a volcano erupts, lava flows out from the top. What type of rock is formed as the lava cools? | [
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Michael learned that the movement of Earth in the solar system causes changes that can be seen on the planet. Which change could be seen on Earth in the time it takes Earth to rotate once on its axis? | [
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Two layers of sedimentary rock are exposed on the side of a hill. Only one of the layers has fossils. The lack of fossils in one layer of sedimentary rock is most likely due to | [
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A scientist investigated the effect of workplace stress on heart disease in humans. Men of various ages were divided into two groups based on whether they described their work as very stressful or not very stressful. During the one year investigation the scientist monitored the heart health of each man. What was the bias in this investigation? | [
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... |
The largest body in our solar system is | [
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After a soccer game, Brittany sat under a fan because she was hot. Under the fan, she felt cooler than before. Which explains why Brittany felt cooler under the fan? | [
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Salivary amylase is an enzyme in the human body that digests carbohydrates from food. When food mixed with saliva enters the stomach, the action of salivary amylase slows dramatically. Which causes salivary amylase enzyme to stop digesting food? | [
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Of these research projects, which is the best choice for a student who is interested in environmental issues to study? | [
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Two identical plants are planted 3 meters apart. One plant is flowering, but the other is not. A student concludes that the plants are receiving an unequal supply of water. Another possible explanation the other plant is not flowering is that the plants are | [
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Which of these is a nonliving thing? | [
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Suppose a new fuel for cars is derived from coal. Cars can go twice as far on a tankful of the new fuel as they can on the same amount of gasoline. How would you categorize the new fuel? | [
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Which of the following best explains how stems transport water to other parts of the plant? | [
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Chris left a glass of water on a windowsill. When he looked at the glass a few days later, some of the water had evaporated. Which of the following best describes what happened to the particles of water that evaporated? | [
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A parent and a child share several characteristics. Both individuals are tall, have curly hair, are good cooks, and have freckles. Which of these characteristics is a learned behavior? | [
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Cell membranes are described as selectively permeable. Four students were asked to explain what this means and provided the answers given below.Student 1: Cell membranes prevent all materials from entering the cell.Student 2: Cell membranes only provide structural support for the cell.Student 3: Cell membranes regulate which substances can enter and exit the cell.Student 4: Cell membranes allow water and water-soluble substances to enter the cell.Which student correctly identified the function of the selectively permeable membrane? | [
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Most of the volume of the universe is found in the space between galaxies. Objects found in the regions between galaxies are most likely to be closest in size to which of these? | [
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Which best represents the use of mechanical energy? | [
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The composition of soil influences the soil's ability to retain and transmit water and air. What soil type would be best for planting a productive garden? | [
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In 1783, Europe was unusually cold and foggy. The rain was acidic. Which event most likely caused the unusual climate in Europe that year? | [
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The Moon lacks weather and climate changes like those on Earth. What causes the lack of weather on the Moon? | [
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A bus traveled 280 kilometers between two cities. It left the first city at 3:00 p.m. and arrived at the second city at 7:00 p.m. What was the average speed of the bus during the trip? | [
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Which factor can increase the amount of sulfur dioxide in the air? | [
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0.... |
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