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a system of naming organisms.
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
reactions in which large complex molecules are broken down to form smaller,simpler molecules;...
structure within the cell cytoplasm that is surrounded by its own membrane and has a specific...
the introduction of harmful substances (pollutants) into the environment.
(also called the pith) the central part of the stem that consists of large, thin-walled...