"The part of the nervous system that quiets the body after arousal and helps maintain vital functions (like breathing) at moderate levels is the branch."

Parasympathetic

Explanation:

The parasympathetic nervous system of the autonomic division serves to calm down the person after any emergency or stress condition. The activated parasympathetic division is responsible for slowing down the physical responses that were activated by sympathetic division. The parasympathetic division triggers digestion and absorption of food and maintains the heart rate and breathing rate at a moderate level.

answer; i believe that the correct answer is(d) nondisjunction during meiosis;