Wouldn't a more accurate description be: natural selection keeps stabilizing human populations, by removing harmful mutations.
New Nature paper shows recent 'purifying selection' (against harmful mutations) on most human traits studies, including educational achievement. Evolution keeps shaping us, but mostly it's to keep us from falling apart.https://www.nature.com/articles/s41588-018-0101-4 …
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Yes, purifying selection is a subset of stabilizing selection.
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