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Q.

If the water in which the tadpoles are growing does not contain sufficient [[1]] mineral, they cannot become adults. 

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a

Iodine

answer is A.

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Detailed Solution

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Tadpoles cannot become adult frogs if they do not have a sufficient amount of iodine in water because in lesser iodine thyroxine hormone can't get secreted by the thyroid gland. 

Thyroxine hormone is essential for tadpoles to become adult frogs. 

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If the water in which the tadpoles are growing does not contain sufficient [[1]] mineral, they cannot become adults.