Matching Pairs Skeletal SystemOnline version Match the following by Ms. Burton 1 The skull 2 The spine 3 Bones are made out of ? 4 The ribs 5 The hardness of bones is called ____________ Protects the brain and forms the shape of the face. Protect the heart, lungs, and other organs in the chest cavity. Crystals of Calcium Different kinds of tissues/ Made up of vertebrate that support and protect the spinal cord.