Which system includes the bones that support limbs and facilitate movement?

The appendicular skeleton is the correct choice because it specifically includes the bones of the limbs—such as the arms and legs—as well as the bones that connect the limbs to the trunk of the body, such as the shoulder girdle and pelvic girdle. This skeletal structure plays a crucial role in facilitating movement and supporting various types of physical activities, allowing for a wide range of motion in the limbs.

In contrast, the axial skeleton consists of the bones along the central axis of the body, which includes the skull, vertebral column, and rib cage. While it provides important support and protection for vital organs, it does not include the limb bones important for movement.

The immune system is responsible for defending the body against infections and diseases but does not involve bones or support for movement. Likewise, the muscular system consists of muscles that enable movement but relies on the skeletal system for structure and support. Thus, the appendicular skeleton is precisely the component that connects to the limbs and their ability to facilitate various movements.