EXCRETION
Excretion is a biological process where cellular metabolic waste products are removed from the body.
Or
Is a removal of unwanted substances (metabolic products) from the body as fast as they exceed a certain concentration.
Or
Is a process by which metabolic waste products is eliminated from the body of an organism.
Metabolic wastes are produced as the result chemical reactions taking place in the cells e.g. cellular respiration. Metabolism produces useful products as well as toxic (poisonous) by-products. The toxic substances have to be removed as they are harmful if allowed to accumulate.
NOTE
Metabolism is the chemical processes that occur within a living organism in order to maintain life example respiration, digestion and photosynthesis
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