Plaglarism can occur accidently because of problems with using?

Plagiarism can occur accidentally  when  don't  you add the source of your  evidence.

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.