Question

If the water in which tadpoles are growing does not contain much iodine, they die. Why?

Answer 1

they will die as tadpoles for living require iodine which is important for ther metabolic activities

Answer 2

The frogs release a harmone by thyroid gland . This hormone requires the presence of iodine in water for its production. If the water in which tadpoles are growing is not sufficient in iodine , the tadpoles Cannot and cannot become adult frogs.