Question

secretes the hormone thyroxin, which is involved in regulating metabolic functions and physical growth
thyroid gland
prostate gland
sweat gland
pituitary gland
endocrine gland

Explanation:

The thyroid gland is responsible for secreting thyroxin, which plays a key - role in regulating metabolism and physical growth. The prostate gland is related to male reproductive functions, sweat glands are for thermoregulation and excretion of waste through sweat, the pituitary gland is the 'master gland' that controls other endocrine glands and secretes various hormones not including thyroxin, and the endocrine gland is a general term for glands that secrete hormones into the bloodstream, and the specific gland secreting thyroxin is the thyroid gland.

Answer:

A. thyroid gland