Elastic cartilage is found in only two locations. It forms the external ear and the epiglottis. It is able to stretch and bend repetitively without braking or tearing. Fibrocartilage softens the pressure that is exerted from the bones. It is found in the knee and forms the discs between the vertebrae.
Bones are alive, they are organs.
Bones provide a framework that supports the body. They also provide protection for the internal organs. For example, the fused bones of the cranium protect the brain from injury. Bones also allow for movement, because they provide a place for the attachment of skeletal muscles. Bones store the minerals and then release them into the bloodstream as ions.