Answer the following question given this paragraph: 

The brain and spinal cord are protected within bones of the skeletal system, but injuries to these organs still occur. With mild injuries, there may be no lasting effects. With severe injuries, there may be permanent disability or even death.


Q: Bones are part of which body system?

 Choices:

- hard system

- circulation system

- muscular system

- skeletal system

A:
skeletal system
