what is the function of thyroxine in the life cycle of the frog?

The hormone thyroxine is also known to play an important role in metamorphosis in frogs. Young tadpoles do not develop into mature frogs if the water in which they grow lacks iodine which is required for the formation of thyroxine.
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Thyroxine helps in he growth of the frog
 
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The chemical substance thyroxine produced by thyroid glands play a very important role in the life of frog. If thyroid gland is removed from body of a tadpole it will not change into an adult frog.
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