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excretion Reference library
The Oxford Companion to the Body
is the transfer of substances out of a living organism into its environment. At its simplest, for single-cell forms of ...

excretion Quick reference
World Encyclopedia
Elimination of materials from the body that have been involved in metabolism. In mammals, these wastes excrete mainly as ...

excretion Quick reference
The Oxford Dictionary of Sports Science & Medicine (3 ed.)
The elimination of metabolic wastes (including carbon dioxide and urea) from the body. ...
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