Metamorphosis can be accelerated by

I_{2}

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Solution

The correct option is A $I_{2}$
Metamorphosis occurs as the tadpole tail shrinks and the legs grow. At this time, the tadpole will first grow a pair of hind legs, then a pair of front legs. The body also typically becomes shorter and broader. Tadpoles treated with thyroxine (thyroid hormone) or iodine will develop at an increased rate, whereas tadpoles treated with thiourea, a thyroid-hormone inhibitor, will metamorphose at a slower rate.

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