Answer the following question given this paragraph: 

Running. A means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. The knees, which connect one part of the leg to the other, have to allow the legs to move. The knee is a joint, the part of the skeletal system that connects bones.


Q: What do you call the part of the skeletal system that connects bones?

 Choices:

- fibers

- muscles

- tissue

- joints

A:
joints
