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The rate at which an object's position changes.
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A particle with a negative charge.
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The cooperative relationship of two different
species.
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The smallest unit of living matter that can function
by itself.
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A living thing that is composed of one or more
cells.
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A small piece of a substance that is made up of
at least two atoms.
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A tiny particle of matter that is the smallest
piece of an element.
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A particle with a positive charge.
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The center of an atom.
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The physical matter and existence of an object.
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