• MonkderVierte@lemmy.mlEnglish
    1·
    1 个月前

    minor mutations that would only provide an advantage in extreme specific scenarios … wouldn’t have a chance to be spread.

    Most north europeans can digest lactose.

    • Demdaru@lemmy.worldEnglish
      3·
      1 个月前

      Black death IIRC. Milk was one of few easily availabke foods when farmers died off. So, extremely specific scenario.

    • zalgotext@sh.itjust.worksEnglish
      3·
      1 个月前

      North Europe is a frozen wasteland where nothing grows for like a third of the year, being able to digest lactose in those months is hugely advantageous. I don’t think “winter” counts as an “extreme specific scenario”