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Define excretion |
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Answer» ExcretionExcretion is the process of removing harmful metabolic wastes such as urea, uric acid and salts from the body.Excretion in organisms\tUnicellular organisms, like amoeba, remove wastes by simple diffusion from the body surface into the surrounding water.\tLower multi-cellular organisms like flat worms use flame cells while earthworms use nephridia for excretion.\tHigher multi-cellular organisms like fish, frogs, lizards, birds and humans use kidneys for excretion.\xa0Homeostasis is the tendency of the physiological system of higher animals to maintain internal stability of the body. The process of removal of metabolic waste from the body is called excretion |
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