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10.4: Lactase Persistence
https://bio.libretexts.org/Bookshelves/Evolutionary_Developmental_Biology/Evolutionary_Developmental_Biology_(Rivera)/10%3A_Case_Studies/10.4%3A_Lactase_Persistence
What we call "lactose intolerance" in adults is actually the ancestral state for humans. The evolution of the ability to digest milk sugar (lactose) as adults has happened multiple times in humans.

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