I thought eyes evolved indepedently half a dozen times in earth's history.
http://en.wikipedia.org/wiki/Evolution_of_the_eye
http://www.sciencedirect.com/science...44d8e1feb48b88
The genetics of eye formation thus suggest that vertebrate and insect eyes are homologous, yet it seems impossible to trace the eyes themselves back to a common ancestor. How can these apparently incompatible facts be understood?
Last edited by troutman; 09-07-2009 at 10:56 AM.
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