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