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microscopic canals running longitudinally through compact bone tissue that contain blood vessels, nerves and lymph vessels.
a type of nuclear division during which reproductive cells divide to produce gametes. The...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque....
a special kind of biological identification key which consists of sets of organised pairs of...