This difference in size between men and women is called sexual dimorphism. It is seen across many species. Generally in mammals, the male is larger than the female, and in insects the opposite is true.
Men are on average 15-20% larger than women. This is a relatively small margin compared to many other species. This difference suggests that in our evolutionary past we were monogomous. When males are much larger than females, the males are spending a lot of their time fighting for access to females. But when this difference is smaller, like in humans, it suggests that our ancestral males were spending less time fighting and more time helping raise offspring.
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