A) \[{{I}_{2}}\]
B) \[K\]
C) Na
D) \[Cl\]
Correct Answer: A
Solution :
Metamorphosis is the phenomenon of events through, which a herbivorous tadpole is converted into an adult carnivorous frog. The metamorphosis of frog is controlled by the thyroid hormones that contain iodine element. Thus, addition of \[{{\text{I}}_{\text{2}}}\]element in water speeds up the metamorphosis in frog tadpole.
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