The following substances are the excretory products in animals. Choose the least toxic from among them.

Urea

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Uric acid

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Ammonia

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Carbon dioxide

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Solution

The correct option is A Uric acid
Nitrogenous waste substances such as ammonia, urea or uric acid are produced during protein metabolism according to the species. A small amount of nitrogenous waste substances are also produced during the metabolism of nucleic acids. Ammonia is the most toxic, followed by urea and then uric acid.
So the correct option is B.

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