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End products of metabolism are the final result of the breakdown of other metabolites and are excreted from the organism without further change; they usually cannot be used to synthesize other metabolites. Urea, for example, is an end product of protein degradation in man, the other primates, and the Dalmatian dog. Carbon dioxide is usually thought of as an end product of carbohydrate, protein, and fat degradation in aerobic organisms, although technically, carbon dioxide, as carbonic acid, can participate in the biosynthesis of some substances, particularly in plants.
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