Final answer:
The pectoral girdle comprises the clavicle and the scapula, with the scapula being the bone that pairs with the clavicle to connect the upper limbs to the axial skeleton.
Step-by-step explanation:
The bone that makes up the pectoral girdle together with the clavicle is the scapula. The pectoral girdle is responsible for attaching the upper limbs to the body's axial skeleton. It mainly consists of two bones: the clavicle, also known as the collarbone, situated in the anterior, and the scapula, also known as the shoulder blade, located in the posterior. The scapula is a flat, pear-shaped bone that forms part of the shoulder joint, while the clavicle acts as a strut between the scapula and the sternum and plays a crucial role in transmitting forces from the upper limb to the trunk, besides providing support and protection to the underlying nerves and vessels.