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Birds, reptiles, and insects are classified as URICOTELIC because they primarily excrete:

AAmmonia (highly toxic, common in fish)
BUric acid (low toxicity, very little water)
CUrea (moderately toxic, common in mammals)
DCreatinine (a muscle breakdown product)
Answer & Solution
Correct answer: B. Uric acid (low toxicity, very little water)
Uricotelic animals excrete URIC ACID (insoluble paste, low toxicity, requires minimal water). Suits flying birds + desert-dwelling reptiles. Aquatic = ammonotelic; mammals = ureotelic.
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