Answer :

a. Adrenaline.

It is secreted by adrenal gland during emergency situations. It helps us to face the situation or flight away from it. It is secreted by anger, fear, grief, stress etc.

b. Growth hormone

It is secreted by the pituitary gland which regulates the growth of our body including tissues and bones.

c. Insect hormones.

It regulates the metamorphosis process of a caterpillar to moth. The larvae enter various stages and form a moth.

d. Thyroxine

It is secreted by the thyroid gland which regulates the development process of a tadpole into an adult frog. This process is called metamorphosis.

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