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| Structures that help organisms survive in their surroundings. |
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| The air above the earth's surface. |
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| The smallest particle of a substance that has all the properties of the substance. |
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An imaginary line that passes through Earth's center from the North Pole to the South Pole. |
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| The up and down line at the left side of the graph. The numbers next to it tells you the height. The side to side line at the bottom tells you whats being measured. |
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| Animals that eat other animals. |
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| A physical change that occurs when a solid, liquid or gas turns into other forms such as when ice changes to water. |
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| Happens when one or more substances change into one or more new substances. |
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| Populations that live in the same place at the same time. |
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| A subtance which molecules contain atoms of different elements. |
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| The change from water vapor to liquid water. |
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| The wise use and protection of natural resources. |
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| A group of stars that ancient people thought formed a picture in the sky. |
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| Organisms that get energy by eating other organisms. |
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| Organisms that get energy by feeding on dead materials and wastes. |
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| The amount of mass in a known volume of an object. |
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| Drops the materials from erosion in a new place. |
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Happens when huge slabs of rock move against each other deep below the earths surface. |
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| All the populations and nonliving things interacting in an enviornment. |
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| A pure substance made of only one kind of atom. |
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| A diagram that shows the amount of energy passed on at each level of a food chain. |
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| A change of energy from one form to another or the movement of energy from one object to another. |
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| The surroundings that an organism lives in. |
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| An imaginary line around the middle of Earth halfway between the two poles. |
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| Carries weathered materials away from a place. |
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| Liquid water changes to a gas called water vapor. |
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| A scientific investigation that tests a hypothesis. |
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| A path of energy from one organism to another. |
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| Shows different pathways for the flow of energy in an ecosystem. |
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| The remains or traces of organisms that lived long ago. |
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| A force that works against motion. |
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| A group of between 1 million and 1 trillion stars. |
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| A state of matter in which the substance takes both the shape and volume of its container. |
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| A force of Attraction between to masses. |
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| A force that pulls objects toward each other. |
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| The specific enviornment that meets an organisms needs. |
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