The major excretory product of birds is

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Urea

Uric acid

Nitrates

Ammonia

answer is B.

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Detailed Solution

Concept: Uridines are broken down by the body, releasing the molecule uric acid. Purines are a naturally occurring substance in the body as well as in many foods and drinks. Significant amounts of purines can be found in liver, anchovies, mackerel, dried beans and peas, beer, and dry fish.
Uric acid is the primary excretory product of flying organisms. Animals' bodies often produce harmful alkali as a result of nitrogen waste, which must be expelled. Humans and other highly developed organisms expel urea, whereas birds, reptiles, and a few terrestrial spineless creatures expel uric acid as waste products.
Thus, the appropriate response choice (2) .

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