Question

100 POINTS

Complete the sentence: Combustion heating and cooling appliances are sources of
and often found in basements.
O asbestos
O radon gas
O tobacco smoke
O carbon monoxide

Answer 1

carbon monoxide is the awnser

Step-by-step explanation:

When I took this quiz that was the right awnser.

Answer 2

Carbon monixide

Step-by-step explanation:

Right answer