What anatomical difference between men and women appears in the fossil record around 2 million years ago?

Question

Quizplus · Accepted Answer

Around 2 million years ago, the fossil record shows an increase in the width of the pelvis in females, which can be attributed to the evolution of bipedalism and the need to accommodate the birth of larger brained infants. This anatomical difference does not necessarily result in increased sexual dimorphism or longer legs in males, and while brain size did increase throughout human evolution, it was not necessarily a distinct difference between males and females.

What Anatomical Difference Between Men and Women Appears in the Fossil