What is the first excretory substance in animal body?

Urea

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Ammonia

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Amino acid

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Uric acid

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Solution

The correct option is B Ammonia
Ammonia was the first and simplest excretory substance in the animal body and is excreted as it is toxic. It requires large amounts of water for its excretion and so it is seen in most aquatic vertebrates and invertebrates.
So, the correct answer is 'Ammonia'.

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Which of the following is not the excretory substance of animals?

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