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the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque.
a type of nuclear division during which reproductive cells divide to produce gametes. The...
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
the field of study that provides scientific names for organisms, describes them, preserves...
the tube through which urine passes from the bladder to the exterior.
a drug that inhibits (slows down) the action of the nervous system.