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"Excretion is important for the elimination of nitrogenous wastes formed during the metabolism of proteins (amino acids) and nucleic acids.For elimination of excess salts like common salt (NaCl), vitamins, bile pigments (from the breakdown of old RBCs)The removal of excess water or its retention just in case of shortage. This helps to take care of the specified quantity of water – osmoregulation within the body."
<https://www.vedantu.com/biology/ammonotelism>