868
Accurate.
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Can you illustrate how, in an example? You seem to be decisive this is true, but it isn't obvious to me and I didn't see an explanation yet.
If possible, try to link your explanation to concepts used in https://en.wikipedia.org/wiki/Eugenics, so that we don't talk past each other.
From my possibly still uneducated point of view, what happens to elderly people (who don't procreate) can not alter the gene pool.