How did we manage to become so diverse if we all come from the same “mother” is my question. The blood thing is a correlated thing
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The further back you go in the family tree, the more opportunity there has been for genetic mutations. It’s not just that all humans share a common ancestor. All living things share a common ancestor. It’s just that over time a group of offspring from that common ancestor became humans and another group became e.g. bananas, all through random mutations and Darwinian selection. That’s a much bigger difference than blood types.
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