Which autonomic system conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure? a peripheral nervous system
b sympathetic nervous system
c somatic nervous system
d parasympathetic nervous system

The correct answer would be D parasympathetic nervous system.

The parasympathetic nervous system controls the involuntary functions of the body when it is at rest.

The responses of this system are commonly called "rest and digest" responses.

It helps in maintaining the homeostasis in the body.

It helps in increasing the peristaltic movements of the intestine and ureters.  

It lowers the heart rate and blood pressure and helps in returning the body to a normal activity level.

Thus, parasympathetic nervous system help in conserving energy by returning the body to a normal activity level through a lowered heart rate and blood pressure

carbon atoms, hydrogen, oxygen, and nitrogen.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.