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the number of people per unit area.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
a drug that inhibits (slows down) the action of the nervous system.
the remains of digestion, which are eliminated from the body via the anus, and contain...