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Why is excretion
Numerous waste products are formed during the metabolic activities that take place in the body. These products become toxic or harmful if retained inside the body. Large amounts of carbon dioxide and water are produced by metabolism of carbohydrates, fats, and protein. Nitrogenous wastes such as ammonia, urea, uric acid etc. are formed in the metabolism of proteins and other complex nitrogenous compounds.
These waste products have to be expelled from the body so that they do not do us any harm. The common excretory substances include carbon dioxide, water, urea etc.
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