3rd 9 weeks

A group of bones forming the frame for the body is the ____

The 33 bones in the back that protect the spinal cord are the ____

Bones have a hard outer layer and then a layer of ____ bone.

Some bones are filled with soft, jelly-like material that produces new blood cells. This material is called ____

An immovable joint can be found in the ____

A joint that allows only back-and-forth movement is a ____ joint.

A joint that allows side-to-side movement is a ____ joint.

A simple machine that is made up of one or more inclined planes and is used to force materials apart is a ____.

An inclined plane wrapped around a cylinder is a ____.

Work is done when a force moves an object over a distance. True or False?