Down there (pls hurryy!!)

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Why does his teacher ask him to balance the equation by including the correct coefficient

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains