As you take notes, your heart beats at a normal rate. your breathing is normal and your stomach slowly digests your earlier meal. what division of the peripheral nervous system is currently in action

The correct answer is parasympathetic nervous system.

Parasympathetic nervous system is the part of autonomic system (controls the function of internal organs) so it means that it is responsible for regulating the body's unconscious actions. The parasympathetic system is responsible for "rest-and-digest" activities that occur when the body is at rest.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

carbon atoms, hydrogen, oxygen, and nitrogen.