There are of muscles that are responsible for chewing movements or mastication.
a. two pairs
b. three pairs
c. four pairs
d. five pairs

There are three pairs known as temporalis, masseter, pytergoid. They work together to move the mandible at the temporomandibular joint. these three muscles are responsible for the chewing action, grinding the teeth, moving our mandible side to side and also assisting us to speak

well idk if im right cause u know but any ways i belive that its civil

impartial means: treating all rivals or disputants equally; fair and just.

i would say that impartial is agreeing with something, because impartial means to treat your rivals, arguments, and reasoning equally and fair. so if you rival says something, agreeing on it means you did the impartial.