C. Every 3 years I believe, for every two years
Answer:
Pumping enough blood to deliver things throughout the body such as oxygen and nutrients
Explanation:
Hope this helps-
I would say marissa , because cheering for your team is a good example of sportsman ship
Because it is flexible. Think about it; the ribs protect both the lungs and the heart. If the ribs were solid bone all the way around then unless you constantly break your ribs you wouldn't be able to expand the cheat to breath. Additionally your lungs would constrict the heart to a degree that it would function properly.