/u/okmuht's posts in /r/askscience

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I understand the evolution of the eye, with it starting off as simple light-dark detection and evolving from there, but how did it start in the very beginning? Wouldn't the light detectors and the "wires" connecting them to the brain correctly all need to appear in a single mutation?

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I understand the evolution of the eye, with it starting off as simple light-dark detection and evolving from there, but how did it start in the very beginning? Wouldn't the light detectors and the "wires" connecting them to the brain correctly all need to appear in a single mutation?	1