It is found in the bones <span>such as hip bone, breast bone, </span>skull<span>, ribs, </span>vertebrae<span> and shoulder blades, and in the cancellous ("spongy") material at the proximal ends of the long bones </span>femur<span> and </span>humerus<span>. </span>
The answer is A. decreased oxygen~
It helps you focus more on things that you need to do and it gets the job done
