Answer the following question given this paragraph: 

The skeletal system is made up of bones, cartilage, and ligaments. The skeletal system has many important functions in your body. What bones protect the heart and lungs? What protects the brain?.


Q: Bones, cartilage, and ligaments make up what anatomical system?

 Choices:

- Integumentary system

- Lymphatic system

- Muscular system

- skeletal system

A:
skeletal system
