What does the appendicular skeleton consist of?

The appendicular skeleton is comprised of the bones that form the appendages or limbs of the body, as well as the girdles that connect these limbs to the axial skeleton. Specifically, it includes the bones of the arms (humerus, radius, and ulna), the bones of the legs (femur, tibia, and fibula), and the shoulder girdle (clavicle and scapula) in the upper body, along with the pelvic girdle in the lower body. This structure allows for a wide range of motion and is essential for movement and mobility.

The other choices do not accurately represent the composition of the appendicular skeleton. The skull and spine are part of the axial skeleton, which supports the head and the trunk. The option that references only the bones of the arms fails to encompass the full range of the appendicular skeleton, which includes both arms and legs as well as their respective girdles. Lastly, stating that it consists of all bones of the trunk refers to the axial skeleton as well, which consists of the skull, vertebrae, and ribs, not the limbs.