The question is what does it regulate. . 1 sentence for each will

a regulate is to control or direct by a rule, principle, or method.

The pituitary gland secretes hormones, which can stimulate growth.

The thyroid gland produces hormones which regulate the body's metabolic rate as well as heat and digestive function

The parathyroid glands are 4 tiny glands that control the bodies calcium level.

The adrenal gland produces hormones that are vital to life, such as cortisol, and aldosterone.

The pancreas regulates enzymes and produces insulin.

The ovaries produce and release eggs into the female reproductive tract and the mid point of each menstrual cycle.

The testes produce testosterone.

You can look these up on google also.

Yes it would be a physical change.

A.(nh4)(2co3)is the correct answer