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Apparently some humans are born with two spleens. What evolutionary pressures likely created the trait, and what future pressures could drive second spleens to become more common? (lemmy.world)

submitted 10 months ago by JoshuaSlowpoke777@lemmy.world to c/nostupidquestions@lemmy.ca

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[–] shreddy_scientist@lemmy.ml 3 points 10 months ago

Well it functions in both blood filtration and for blood/immune cell storage, both of which are critical for staying alive and reproduction. But when it comes to evolution, things aren't always straight forward. Maybe there was a entirely different function which had a bigger positive impact on overall fitness and since the spleen situation didn't decrease fitness, it too was past along.