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The excretory system is a passive biological system that removes excess, unnecessary materials from an organism, so as to help maintain homeostasis within the organism and prevent damage to the body. 
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Excretory system is function going on inside every organism by which toxic substances gets removed from the body of all organism to maintain homeostasis.There are different types of like ureotelic,uricotelic,ammonotelic,aminotelic,etc.
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