Having to carry another person inside of you, logically speaking I’d think would be a task to the taller/bigger one.
In: Biology
Basically it is the other way round or you are looking at it the wrong way, the females aren’t smaller, the males are larger. While this seems the same, it is significantly different, females have to spend all their surplus energy on producing children and raising them, this limits their size. Males have to spend relatively little energy on their children instead they need to out compete other males for access to the females; so they can spend their surplus energy on growing bigger and stronger in an attempt to become the dominant male and so pass on their genes to more offspring.
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