Having to carry another person inside of you, logically speaking I’d think would be a task to the taller/bigger one.
In: Biology
Human women are smaller than human men. In many species there’s little to no sexual dimorphism, in many it’s the other way around. As for humans, it’s the case for primates and many monkeys too – sexual selection by females selected for bigger males because they could protect the pack from other males or predators, so the females can focus on foraging and taking care of offspring.
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