Which of the following glands plays a key role in the metamorphosis of a frog's tadpole?

$I.$ Regulation of $BMR$
$II.$ Supports the process of $RBC$ formation
$III.$ Controls the metabolism of carbohydrates,proteins and fat
$IV.$ Maintenance of water and electrolyte balance
$V.$ Secretion of $TCT$ hormone
Functions written above belong to which of the following glands?

$A$ person appears fat,short,and stocky and has a stupid look and protruding tongue due to the hormonal deficiency of:

The thyroid gland is composed of $2$ lobes which are located on either side of the $trachea$.

What is caused by prolonged disturbance in the secretion of hormones from the thyroid gland?

The follicles of the thyroid gland are composed of which type of epithelium?