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a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva and the bacteria that convert food into acids.
microscopic canals running longitudinally through compact bone tissue that contain blood vessels...
competition between organisms of different species.
variation due to the small differences in the genes that control each feature and characteristic...
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.