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aggasalk t1_jceibkp wrote

all animal eyes use photopigments that are descended from a common ancestor - whether or not that thing (a basal eumetazoan, which would have looked more like a sponge larva than any animal you've ever seen) had eyes, I think probably not. but it seems that, having evolved these supremely useful molecules, evolution figured out pretty quickly the best way to make use of them ("build an eye").

(if there is something recent suggesting a common ancestor to all eyes, i'd really like to see it!)

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