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.
Thank you so much you kind soul
The best way is to just relax and try to act naturally. Just be calm and try to make it a bit funny to hide fear. :)
If your doing moderate intensity workouts/physical activity your only focused on the thing your doing so the answer should be (DISTRACTED)
The correct answer is b, phagocytosis and infection
