How many types of autonomic nervous systems are there?

Dramatic changes of body features associated with puberty are mainly because of the secretion of:

Answer the following:
$(a)$ Name the endocrine gland associated with the brain.
$(b)$ Which gland secretes digestive enzymes as well as hormones?
$(c)$ Name the endocrine gland associated with the kidneys.
$(d)$ Which endocrine gland is present in males but not in females?

Which gland produces the hormone thyroxine?

How is the timing and the amount of hormone secreted by a gland regulated? Explain with an example.

The hormones secreted from which gland regulate the function of the pituitary gland?