The Skeletal System does not only protect all the important body part and keep you standing up right. Inside your bones there is bone marrow. Bone marrow creates blood cells and these blood cells store fat in them. If you didn't have a skeletal system your body whould be a flop.
The Skelital System is all about protecting your body and keeping everything safe and in its place. Without the skelital system your body would be a huge flop, its clear to see that you need your skelital system for protection and keeping your body up right.