The best answer to fill in the blank would be ''Bystander'' because as that role you can go tell any adult or higher authority to stop the fighting so you don't try to be a hero and get yourself hurt as well.
I think you will find carbon, nitrogen, hydrogen, and oxygen.
The answer would be A i assume, hope this helped !
I would say it's the answer with nitrogen oxides and volatile organic compounds
FALSE : the presence of harmful substances in the earth’s atmosphere is called air pollution
