alleryThe 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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