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"It is the removal of all harmful, unwanted products (especially nitrogenous wastes) from the body. The system of excretion majorly deals with the removal of wastes that are nitrogenous in nature. Urea is known to be the primary nitrogenous waste that is excreted in our body. It is made up by the breakdown of surplus amino acids and nucleic acids in the liver. Blood transports urea to the kidneys for filtration and removal within the sort of urine. &#10;&#10;"
<https://www.vedantu.com/biology/ammonotelism>