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single-celled organisms with all life functions performed within the cell.
a rubbery, protein-carbohydrate complex that forms the matrix of cartilage.
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...
microscopic canals running longitudinally through compact bone tissue that contain blood vessels...
coiled nephron tubule which extends from Bowman's capsule to the loop of Henlé.