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The MOST toxic nitrogenous waste excreted by animals is
AUrea formed in liver tissues
BUric acid as solid pellets
CTrimethylamine oxide in fish
DAmmonia requiring much water
Answer & Solution
Correct answer: D. Ammonia requiring much water
Ammonia is the most toxic nitrogenous waste; its elimination requires large volumes of water (ammonotelism). Urea (intermediate toxicity) suits terrestrial mammals; uric acid (least toxic) suits birds and reptiles.
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