http://en.wikipedia.org/wiki/Eye
The first proto-eyes evolved among animals 600 million years ago about the time of the Cambrian explosion.The last common ancestor of animals possessed the biochemical toolkit necessary for vision, and more advanced eyes have evolved in 96% of animal species in six of the ~35 main phyla.
The first proto-eyes evolved among animals 600 million years ago about the time of the Cambrian explosion.The last common ancestor of animals possessed the biochemical toolkit necessary for vision, and more advanced eyes have evolved in 96% of animal species in six of the ~35 main phyla.
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