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_____ is the chemical changes in living cells by which energy is provided for vital processes and activities and new material is assimilated.
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_____ is any of a group of prokaryotic unicellular round, spiral, or rod-shaped
single-celled micro-organisms that are often aggregated into colonies.
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A _____ is a hollow muscular organ of vertebrate animals that by its rhythmic contraction acts as a force pump maintaining the circulation of the blood.