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the upper surface of the ground water.
extremely small infectious particles that can only reproduce inside a host cell.
a relatively small, similar building block of larger molecules (polymers).
a connected network of vessels and glands, which carry lymph throughout the body.
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
(also called selectively permeable membrane) a membrane which allows some substances to cross it...