Question

can a tadpole die without ever becoming an adult if it lives in the water where iodine is not present?

Answer 1

Answer:

Most frogs' lay their eggs in water, but there are exceptions. Frog eggs do not have a shell, so they need some kind of moisture to keep them from drying out until they hatch. Some frogs have come up with amazing ways to keep their eggs wet besides laying them directly in water.

Answer 2

A hormone released by the thyroid gland is a signal for metamorphosis in many amphibians like frogs. This hormone requires the presence of iodine in water for its production. If the water in which tadpoles are growing is deficient in iodine , the tadpoles fail to grow and cannot become adult frogs.