Which of these is not part of the appendicular skeleton?

The appendicular skeleton is composed of the bones that form the limbs and the girdles that connect the limbs to the axial skeleton. The axial skeleton includes the bones of the skull, vertebral column, and ribcage. Out of the options provided, the vertebral column is not part of the appendicular skeleton. The vertebral column is a part of the axial skeleton, and it forms the main axis of the body, providing support and protection for the spinal cord. The other options provided, including the clavicle, scapula, humerus, and femur, are all part of the appendicular skeleton. The clavicle and scapula form the pectoral girdle, while the humerus, radius, and ulna form the arm bones. The femur, tibia, fibula, and patella form the leg bones, and the pelvic girdle connects the legs to the axial skeleton.