Final answer:
The pelvis undergoes anatomical changes to facilitate bipedalism and has important functions such as supporting the weight of the upper body and protecting internal organs.
Step-by-step explanation:
The pelvis, also referred to as the hip bone, undergoes anatomical changes to accommodate bipedalism. These changes include the valgus angle of the femur, spinal curves, the evolution of the foot arch, and realignment of the big toe. The pelvis has several important functions, including supporting the weight of the upper body, serving as an attachment point for muscles, and protecting internal organs.