What structural characteristic distinguishes the pelvic outlet in males from females?

The structural characteristic that distinguishes the pelvic outlet in males from females is primarily related to the size and shape of the pelvic cavity. In females, the pelvic outlet is generally wider and more circular to facilitate childbirth. This adaptation is crucial for allowing the passage of a baby during delivery. In contrast, the male pelvis has a pelvic outlet that is smaller and more heart-shaped, reflecting the differences in anatomy and reproductive requirements. Therefore, the correct response highlights the smaller size of the pelvic outlet in males compared to females, which is a key distinction in human sexual dimorphism related to pelvic structure.