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consists of all the parts of the planet that are inhabited by living things.
includes most regions of land; most bodies of water, and the atmosphere to an altitude of several kilometers. |
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a distinct form of life
more than 1.5 million species and new ones are discovered daily |
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| organizing similar species into larger groups |
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domains:
bactreia and archaea |
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broadest category used to classify life forms
very tiny &unicellular (1 cell) no nuclei (prokaryotic) |
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| unit of multiple organs that together perform a vital body funcion |
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| internal stability or "steady state" maintained by the body |
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controlled- an experiment that tests the effect of a single variable
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| a uniform mixture of two or more substances |
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| pure substance that cannot be broken down into other substances by chemical means. |
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| chemical combination of 2 or more elements |
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| an atom's protons and neutrons are tightly packed together and forming a central core called the nucleus |
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| one of several forms of an element, each containing the same number of protons in their atoms but a different number of neutrons. |
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the formation of one or more new substances occurs
some chemical reactions absorb more energy than they release, while others release more energy than they absorb |
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| the starting materials for the reaction |
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protons
electrons
neutrons |
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| forms when two atoms share electrons |
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pure water
middle of acidic and basic
(zero=more acidic)
(14=more basic) |
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