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_____ is one of the paired compound saccular thoracic organs that constitute the basic respiratory organ of air-breathing vertebrates.
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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.