Why is excretion necessary?
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All organisms need to perform the life processes to prevent extinction, or dying out. ...Excretion is the removal of waste products by an organism. Some waste products are sweat, urine, and carbon dioxide. Without the excretory system many problems can develop in the body.
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Certain waste and harmful substances are formed during the functioning of body cells. ... When these toxic materials are not removed from the body, they get mixed with blood and can damage the cells of the body. The removal of such poisonous waste materials is therefore necessary.
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