Excretion is defined as ........

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(B) Excretion is the biological process by which an organism eliminates metabolic waste products and other toxic or unnecessary substances from its bo

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Removal of unnecessary and excess substances present in the body

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(B) Excretion is the biological process by which an organism eliminates metabolic waste products and other toxic or unnecessary substances from its body. These substances include metabolic wastes (like urea,uric acid,ammonia) and excess substances (like excess water,salts,or ions) that are present in the body beyond the required levels. Therefore,excretion involves the removal of both unnecessary metabolic waste and excess substances to maintain homeostasis.

Column-$I$	Column-$II$
$(a)$ Land snail	$(1)$ Urea
$(b)$ Cartilaginous fishes	$(2)$ Uric acid
$(c)$ Marine fishes	$(3)$ Ammonia

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