What do all bones have in common in terms of structure?

All bones share a similar structural composition, primarily consisting of a matrix of collagen fibers and mineralized materials, predominantly hydroxyapatite, which provides strength and rigidity. They are organized into two main types: compact bone, which is dense and forms the outer layer, and spongy bone, which contains trabecular structures and is lighter. Additionally, all bones are covered by a layer of connective tissue called the periOSteum, which aids in growth, repair, and attachment of muscles. These structural features enable bones to perform their essential functions in the body, such as support, movement, and protection.