1: Teens should be aware of those issues for many reason! Such as helping there future! Helping them have healthy and a not sickness life!
2: So everyone is safe!
3:Not sure sorry
Answer:
Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
Answer:
Pumping blood throughout the cardiovascular system
