Only females would be good. Has that been done before? Yes!...

Only females would be good.
Has that been done before?

Yes! Historically that’s how humans maintained their population numbers.

In the art of war, the majority of males and some females were usually exterminated and only suitable females were kept to replace the losses.

It was the ancient version of an immigration policy.

If we went back to the ancient formula of selection, many immigrants wouldn’t qualify these days.

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