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to change over a period of time in response to new environmental conditions.
the tube through which urine passes from the bladder to the exterior.
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...
the natural resistances with which a person is born. It occurs because of a body's genetic make-...
a fine thread-like structure. In plants: the stalk of the male sexual organ.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...