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.
Answer:
physical, mental and social.
Explanation:
This theory, which talks about that during sleeping we will often dream of things which have happened to use during the day would be the latent processing theory - A.
None of the other apply. The information processing theory is more of a paradigm which referrs to all cognitive functioning as information processing.
C. Dehydration
If the body loses water, then it obviously needs more.
