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