“They’re stupid questions because they’re based on a false premise: that all our systems were developed in humans”
That is only your opinion (”They’re stupid questions”)...to which you are entitled, of course. However, you have no scientific proof that our systems were not developed in humans, and no scientific proof that there was something else in which our systems developed. Right?
Again, if you do not wish to answer the questions, that is understandable. I have not yet found an evolutionist (assuming you are one) who can or will. So...the beat goes on.
Nothing that you'd accept as "proof," I'm sure. There's tons of evidence, but you'd have to be willing to accept, for example, that the kinds of animals whose fossils are found in very old rocks were around before animals whose fossils are only found in younger rocks. Then you might accept that fish hearts developed before amphibian hearts, which developed before mammal hearts. If you can accept that, you'll find that the "heart" goes way back to wormlike creatures.