Which substance is responsible for metamorphosis in amphibians?

The two lobes of the thyroid gland are connected by a thin flap of connective tissue called the.....

$A$ is essential for the normal rate of hormone synthesis in the thyroid. Deficiency of iodine in our diet results in $B$ and enlargement of the thyroid gland,commonly called $C$. Select the correct combination for $A, B$,and $C$.

$A$ pregnant lady delivers a baby who suffers from stunted growth,mental retardation,low intelligence quotient and abnormal skin. This is the result of $:-$

Metamorphosis in amphibians can be accelerated by

Which of the following statements is incorrect?