Final answer:
The main trunk of the body is formed by the axial skeleton, which consists of the skull, vertebral column, and thoracic cage. The appendicular skeleton includes the bones of the limbs and the girdles that attach them to the axial skeleton.
Step-by-step explanation:
The section of the skeleton that forms the main trunk of the body is the axial skeleton.
The axial skeleton consists of the skull, vertebral column, and thoracic cage. It forms the central axis of the body and provides support and protection for the organs within the trunk.
On the other hand, the appendicular skeleton includes the bones of the upper and lower limbs, as well as the pectoral and pelvic girdles that attach the limbs to the axial skeleton.