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The plate-tectonic model has achieved the status of a scientific theory due to which property of the model? | [
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Red is dominant to white for flower color in a particular plant. If a red flowered plant (RR) is crossed with a white flowered plant (rr), what color will the offspring be? | [
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Which statement accurately describes the neutrons in any element? | [
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Which is most like the way a stem supports a flower? | [
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How did scientists arrive at the theory of plate tectonics? | [
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The male insects in a population are treated to prevent sperm production. Would this reduce this insect population? | [
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Which of the following questions is testable in a scientific investigation? | [
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Humus is an organic material that makes up soil. Which characteristic best indicates that soil has a high humus content? | [
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When placed at equal distances apart, the greatest gravitational attraction will be between two | [
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Which is considered a nonrenewable resource? | [
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Which term is used to describe a physical property of a mineral? | [
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Which marine ecosystem is independent of sunlight? | [
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Which occurs as the kinetic energy of water molecules increases? | [
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Many cars are equipped with a catalytic converter, a device that helps remove hydrocarbons and oxides from car exhaust. As a result, this device helps to | [
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Which of the following is least likely to change from a solid state to a liquid state when heat is applied? | [
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A plant gets the energy it needs from the Sun. The plant uses about ten percent of the energy to carry on its life functions. The plant transfers approximately another ten percent of the energy to the consumers in a food chain. What happens to most of the remaining energy? | [
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A student is investigating changes in the states of matter. The student fills a graduated cylinder with 50 milliliters of packed snow. The graduated cylinder has a mass of 50 grams when empty and 95 grams when filled with the snow. The packed snow changes to liquid water when the snow is put in a warm room. Which statement best describes this process? | [
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An appliance manufacturer has redesigned its original electrical fan. It has made the new fan more energy efficient. This means that the new fan | [
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A toothpaste commercial states that a brand of toothpaste has a higher concentration of fluoride than any other toothpaste available. The commercial is most likely inferring that the advertised toothpaste | [
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Students are designing kites to discover what type of kite flies the highest. Which is the most important to consider when designing a kite to fly high? | [
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Manuel wants an area in the yard to wash the dog without making mud puddles. He wants to put something on the ground that water passes through easily. Which of these materials would be the best for him to use? | [
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A doorbell contains a simple electromagnet. Which change would most likely increase the strength of an electromagnet? | [
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The main function of the human digestive system is to | [
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John was using his mp3 player when it suddenly stopped working. What is the first thing John should do to try correcting the problem? | [
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Which action will result in a product with new chemical properties? | [
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Read the equation. 2Ca + O_{2} -> 2CaO What is the product of the reaction? | [
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Which of these would be the best representation of the particles in a solid material? | [
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Cells are the basic unit of structure and function in all living organisms. Which describes the greatest difference between the cells of a baby gorilla and the cells of an adult gorilla? | [
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Which of the following best shows the basic three-step energy transformation for a battery-operated radio? | [
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A student is measuring the boiling point of a salt and water mixture. He takes one temperature measurement of 105°C. Which is the best way to ensure the results are valid? | [
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As a heavy metal ball rolls down a hill, it goes faster and faster. Which statement is true? | [
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What occurs if the body's renal system fails to work? | [
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Plants can help prevent erosion or contribute to erosion. Which describes how plants could contribute to erosion? | [
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In plants, which describes sexual reproduction but not asexual reproduction? | [
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Runoff from nearby farms can deposit excess amounts of nutrients into bodies of water such as lakes. This abiotic process will most likely cause a decrease in which aspect of a lake? | [
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How many atoms are in one formula unit of magnesium hydroxide, Mg(OH)_{2}? | [
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A metal sample is placed into a beaker of boiling water. After two minutes the metal is removed. After 5 minutes the metal can be picked up by hand but the water is still too hot to touch. Which of these matter and energy interactions is being illustrated? | [
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Changes should be made to a scientific theory when | [
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A boat is acted on by a river current flowing north and by wind blowing on its sails. The boat travels northeast. In which direction is the wind most likely applying force to the sails of the boat? | [
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Many common hand tools create a mechanical advantage by using the basic principles found in simple machines. For example, a screwdriver uses the principles of the wheel and axle. In order to increase gripping force, pliers use the principle demonstrated in the | [
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Red-clay bricks have a density of approximately 2000 kg/m^3. Air has a density of 1 kg/m^3. Which of the following has the lowest mass? | [
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0.0541... |
Which of these does not illustrate substances reacting to form new substances? | [
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A pharmaceutical company develops a new antibiotic to treat pneumonia. After limited testing, the researchers conclude that the antibiotic seems to be effective. How can the researchers strengthen their conclusions? | [
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Which of the following is an acquired human characteristic? | [
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Students studying membranes conducted an experiment using labeled paper cups filled with varying concentrations of red food coloring. After the experiment, the cups were empty and stained. What should be done with used cups? | [
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One 7.0 kg bowling ball is lifted to a storage shelf 1.0 m above the floor. A second 7.0 kg ball is lifted to a storage shelf 2.0 m above the floor. Which of the following best explains why the measured force of gravity on each ball is nearly identical? | [
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... |
When gasoline in a car engine is burned, only about 15 percent of the gasoline is converted into mechanical energy. This is because most of the energy in the gasoline is | [
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One of the principal causes of acid rain is | [
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Which of the following factors would most likely cause a hurricane to decrease in strength? | [
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Which best describes the speed of a ball as it is thrown straight up into the air and comes back down? | [
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Two flowers are both roses. One rose is larger and has more fragrance than the other rose. What advantage will one of the roses most likely gain because of this difference? | [
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Which are produced during photosynthesis? | [
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The Moon orbits Earth at a speed of approximately one kilometer per second. The Moon is kept in orbit by which of the following? | [
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What compound is formed when the soft putty-like metal sodium (Na) reacts with the green-colored poisonous gas chlorine (Cl_{2})? | [
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Which of these human activities does not contribute to the extinction of species? | [
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Decomposers are important to the flow of energy in an ecosystem because they | [
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Both hurricanes and tornadoes always ___. | [
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A student is watching a local television weather report for Gloucester, Massachusetts. Which of the following is most likely included in this weather report? | [
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Alan is using cabbage juice to determine the relative pH of various household solutions. Which of these steps communicates the results of his investigation? | [
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What circuit does not allow an electrical current to flow through it? | [
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The classification of some organisms has changed. Which new process is used to reclassify organisms? | [
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Which characteristic property indicates that igneous rock cools slowly? | [
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Which of these is not an example of a physical change of state? | [
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Millions of people living all over the world have cancer. Is cancer a pandemic? | [
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Which of these is a mixture? | [
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... |
Agnes learned that the brain, spinal cord, and nerves work together. What do they combine to form? | [
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Which of these describes water in a solid state? | [
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... |
Margaret is running a full lap around a circular track. She is facing north when she starts. What direction will she be facing after she has completed half of a lap? | [
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During a sporting event, a referee uses a whistle to alert the teams to start and stop playing. What causes the sound from the referee's whistle to travel in all directions? | [
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A "widow's peak" hairline in humans is coded by the dominant allele W. A straight hairline is coded by the recessive allele w. A man with a homozygous dominant WW produces a zygote with a woman with a heterozygous dominant Ww for the trait. Which allele combinations could occur in the zygote? | [
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In studying layers of rock sediment, a geologist found an area where older rock was layered on top of younger rock. Which best explains how this occurred? | [
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A fox gave birth to an offspring that had a better sense of hearing than most foxes. How could this small change most likely result in descendants that are different from the original fox? | [
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Which process forced Nevada's mountain ranges upward over the past million years? | [
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A poultry egg is dissected in science class. What is the clear, thick fluid inside the poultry egg that serves as protection for the embryo? | [
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Which phrase best describes the mass of an object? | [
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... |
Approximately how many times does the Moon revolve around Earth during one revolution of Earth around the Sun? | [
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Plants use nutrients found in soil. Which of these can break down in soil and become nutrients? | [
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... |
A student accidentally drops a test tube that breaks when it hits the floor. Which method is the best way to retrieve the broken glass? | [
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Which of the following characteristics is used when classifying organisms within the plant kingdom? | [
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0.01253... |
Students study human body structure to learn how the body functions. Which life-size model would best represent the size, shape, and location of human internal organs? | [
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... |
Which best describes a parallel circuit? | [
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0.025... |
The interior of Earth is made up of several physically different layers. The solid layer of Earth that moves over a viscous layer is called the | [
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What do the energy resources uranium and coal have in common? | [
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Which of the following has the greatest effect on the speed at which sound travels through a gas? | [
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A mountain with a melting glacier has a stream with a waterfall. The waterfall fills a lake at the base of the mountain. Where is the water coldest? | [
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Many stars can be seen in the sky at night. Which statement best explains why the Sun appears brighter than the stars seen in the night sky? | [
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The temperature of water in a glass changes from 5°C to -1°C. How will the water most likely change? | [
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Helena investigates how enzymes are important to body processes. How is the role of enzymes in biochemical activity best explained? | [
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Which best explains how most soils are alike? | [
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Which action is most likely a learned behavior? | [
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A student is investigating a light bulb that saves energy and can last up to 10 times longer than other bulbs. Other than saving energy, which is another benefit of using these light bulbs? | [
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A student is trying to identify a mineral that has a nonmetallic luster and is black. It can also be scratched with a fingernail. According to the mineral reference sheet, the unidentified mineral is most likely | [
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How much time is required for a bicycle to travel a distance of 100 m at an average speed of 2 m/s? | [
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A scientist working on a new package design wants to use a material that is highly recyclable, biodegradable, and inexpensive. The best material for the package design is | [
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During a lecture, a professor was talking about the potential that hydrogen has for exploding under certain conditions. Which was most likely the topic of the professor's lecture? | [
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An engineer measured the time it takes sound to travel through samples of different materials. All of the samples were identical in shape and size. The measurements were made using ultrasonic waves with a frequency of 5 megahertz. Which question was the engineer most likely trying to answer? | [
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All animals need food to survive. Immediately after an animal eats food, the food is | [
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In 2005, a team of scientists discovered a photosynthetic bacteria living near the molten lava of a thermal vent ecosystem deep in the Pacific Ocean. The bacteria lived 2400 meters below the surface of the ocean, yet made energy from photosynthesis. Which conclusion best explains the results? | [
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A student investigates how speed changes as a ball travels down a ramp. Measurements taken by computer every second are recorded on a data table. Which diagram will best display the data from this table? | [
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Which of these animals has teeth that are most like the teeth of humans? | [
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0.02614728733897209,
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0.009408393874764442,
-0.0180... |
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