For thousands of years men (some women too maybe) were the ones out fighting lions while the women were raising children
And stuff similar to that.
Exactly, these are your standard hunter-gatherer stereotypes. The great thing about the modern world is that those stereotypes are useless here. We aren't hunter-gatherers anymore, both men and women fill both stereotypical roles now.
saying that biology and psychology are the same because "science", and therefore are fit to counter/cross-reference/generally speak of in the same breath while trying to uphold in an argument, is like saying that american football and lacrosse are the same because "sports"
when they're two specific fields of science that, while they do share some similarities, are ultimately different enough that trying to use them both so closely is like trying to eat soup with a goddamned fork
it ain't gonna work, pal
No, let me explain how science works.
Science works based on the scientific method. This is universal across all fields of science, including psychology, neuroscience and biology.
If you come up with a theory, like say "E=mc
2" or "Transgendered people have something fundamentally in common with the opposite love of them that makes them feel the way they do," then you can design experiments, and when performed either help reinforce or disprove that theory. The more expanatory power your theory has and the more experiments that corroborate it, the greater chance that it's reality.
This is a universal method of figuring out what is and isn't true, it applies to all fields. And when two different fields of science all agree based on their experiments and observations that something is true, when either field alone could conclusively prove that it's real, it's doubly certain because the scientific method is what links them.