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this post was submitted on 15 Sep 2023
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Showerthoughts
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The wikipedia article Polydactyly in stem-tetrapods has some explanations on how we ended up with 5 fingers and toes.
The gist of it is that tetrapods (four-limbed vertebrate animals) evolved from a fish similar to a lobe-finned fish that had 5 sets of bones in each of its fins that evolved into fingers and toes. Some tetrapods have subsequently lost digits but the basal state was five.
There's a book, Your Inner Fish by Neil Shubin that's full of this kind of stuff. Highly recommend.
I love it. So many things in the world don’t really have an “explanation,” they have a “story.”
The reason they are as they are is just because of prior conditions.
Amazing book. I recommend reading it if you're interested in evolution.