It's not true that the emergence of blood types has anything to do with, like, agrarian societies. The only way in which this works is if you sort of believed that there is some like, unlocking the mystery of the past evolution. And a lova blod rit, weare like, no, it's just sekand food. Iact, let it be food. There's actually like 30 other ways of classifying people's blood. It's really facile to be like, this is the only thing about blood that matters for transplants. But, like, blood is complicated, my guy.