A) Urea
B) Guanine
C) Uric acid
D) Ammonia
Correct Answer: D
Solution :
In the tadpole, the end product of nitrogen metabolism is ammonia which is easily disposed off by diffusion in water. After metamorphosis, the frogs excrete most of their nitrogen in the form of urea. The latter is highly toxic and if accumulation in terrestrial animal, it could become dangerous.
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