Because its air we cant see it thats why its clear because it would be scary if we were able to see air! :)
The answer to this should be:
<span>introduction</span>
Answer:
C
Explanation:
It's an exersize done without oxygen :)
Answer:
the nicotine damages their lungs
Explanation:
a non smoker wouldn't have nicotine or anything else caused by smoking affecting their lungs. non smokers would have way healthier and less infection prone lungs than smokers
Answer:
the diaphragm helps draw air into the lungs
