Because two skeletons are joined with nut and bolt.
i think it is capering
The most structural joint that occurs in the human skeleton is hyoid bone
sacroiliac joint
Immoveable joint .
sacroiliac joint
sacroiliac joint
The sternoclavicular joint connects the axial skeleton (through the sternum) to the appendicular skeleton (through the clavicle).
The joint between the axial skeleton and the pelvic girdle is called the sacroiliac joint. It connects the sacrum of the axial skeleton to the ilium of the pelvic girdle. This joint is important for transferring forces between the spine and the lower body during activities such as walking and running.
The only joints joining the upper extremities to the axial skeleton are the acromioclavicular joints, a joint between the acromion on the scapula and the clavicle.
i think it is capering
50
By the sacroiliac joint