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| the part of Earth that contains all ecosystems |
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| community and its nonliving surroundings |
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| populations that live together in a defined area |
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| group of organisms of one type that live in the same area |
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| tissues, organs, and organ systems |
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| smallest functional unit of life |
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| groups of atoms; smallest unit of most chemical compounds |
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| bond formed when one or more electrons are transferred from one atom to another |
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| bond formed when electons are shared between atoms |
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| the process that separates things in a test tube according to density |
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| attraction between molecules of the same substance---water ---insects on water |
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| an attraction between molecules of different substances |
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| a material composed of 2 or more elements or compounds that are physically mixed together but not chemically combined |
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| mixture of water and nondissolved material |
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| used to indicate the concentration of H+ ions in a sloution |
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| acidic solutions contain higher concentrations of H+ ions than pure water and have pH values BELOW 7 |
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| basic/alkaline solutions contain lower concentrations of H+ ions than pure water and have pH values ABOVE 7 |
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