True. This statement is accurate. The human pelvis exhibits the most pronounced sexual dimorphism (differences between males and females) in the entire skeleton, and this is primarily due to the **obstetric (childbirth) adaptations** in females. The female pelvis is evolutionarily shaped to allow for the passage of a baby's head during birth. Key diagnostic features include: a **wider, more bowl-shaped pelvic inlet**; a **broader, shallower greater sciatic notch**; a **wider subpubic angle** (usually greater than 90 degrees); and a **ventrally curved sacrum**. In contrast, the male pelvis is generally taller, narrower, and more robust, with a heart-shaped inlet, a narrow sciatic notch, and a subpubic angle less than 90 degrees. These differences are functional and therefore highly consistent. While the skull also shows sex differences (e.g., brow ridge size, mastoid process size, chin shape), these traits are influenced by a combination of genetics and hormones and show more overlap between the sexes. In forensic practice, if a complete adult pelvis is available, it is considered the single most reliable skeletal element for sex determination, with accuracy rates often exceeding 95%. The skull is used as a secondary indicator, especially when the pelvis is incomplete.

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