The transition from amphibians to mammals involves the limb becoming arranged to support the weight more effectively requiring modifications in the

The transition from amphibians to mammals involved the evolution of limbs that were arranged to support the weight of the animal more effectively. This required modifications in the pectoral and pelvic girdles. The pectoral and pelvic girdles are the bones that connect the limbs to the axial skeleton, and they provide support for the entire body. In mammals, the pectoral and pelvic girdles became more robust and were modified to provide a stronger attachment for the limbs. This allowed mammals to support their weight on land and to move more efficiently. The collar bones and coccyx, scapulae and clavicles, and vertebrae and sternum are also important bones, but they were not the primary focus of modification in the transition from amphibians to mammals.