Question

the thyroid, thymus, and adrenal glands are found in the:
a muscular system.
b nervous system.
c endocrine system.
d male reproductive system.

Explanation:

The thyroid, thymus, and adrenal glands are endocrine glands that secrete hormones into the bloodstream to regulate various bodily functions. They are part of the endocrine system.

Answer:

C. endocrine system