A) intestine
B) lung
C) nervous system
D) heart
Correct Answer: C
Solution :
The structure, which remains unchanged during metamorphosis in .frogs tadpole, is nervous system. Metamorphosis in frog is a thyroxin mediated process during which changes occur in the structure of lung, heart and intestine, but there is no such a severe change in nervous system. Only, brain acquires its normal system. Only, brain acquires its normal shape and size.
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