Bones are classified into two main divisions based on the skeletal system:

Here is the answer to question 4: Bones are classified into two main divisions based on the skeletal system: Axial Skeleton*: This division forms the central axis of the body and includes bones that protect internal organs and provide support. It consists of: • Skull: Cranial bones and facial bones. • Vertebral Column: Cervical, thoracic, and lumbar vertebrae, sacrum, and coccyx. • Thoracic Cage: Sternum and ribs. • Hyoid Bone. Appendicular Skeleton*: This division consists of the bones of the limbs and the girdles that attach the limbs to the axial skeleton, enabling movement. It includes: • Pectoral Girdle: Clavicle and scapula. • Upper Limbs: Humerus, radius, ulna, carpals, metacarpals, and phalanges. • Pelvic Girdle: Two hip (coxal) bones. • Lower Limbs: Femur, patella, tibia, fibula, tarsals, metatarsals, and phalanges. What's next?