3 ms·
They just evolved in multiple steps, see https://en.m.wikipedia.org/wiki/Evolution_of_the_eye https://en.m.wikipedia.org/wiki/Evolution_of_the_eye
by jfim 6y ago
They just evolved in multiple steps, see https://en.m.wikipedia.org/wiki/Evolution_of_the_eye https://en.m.wikipedia.org/wiki/Evolution_of_the_eye