Final answer:
Differences in shape and size of the pelvis bones allow for accurate sex determination.
Step-by-step explanation:
When determining sex based on the pelvis, there are several key differences between the female and male pelvis that can be observed. The female pelvis is wider than the male pelvis, indicating adaptation for childbirth. The subpubic angle is larger in females, while the sciatic notch is narrower in males. These differences in shape and size of the pelvis bones allow for accurate sex determination.