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Absolutely, but bear in mind that even today, most people have a very similar genome to their neighbours. So if people behave towards each other in a way which means people with similar genes survive, that genome will survive. If you have a village of people who are too busy killing each other to gather any food, their genome won't survive. Of course it's a bit more complex than that, because it's an emergent phenomenon, but it boils down to the same thing.
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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