2006-09-05 22:48:04 · 7 answers · asked by Don 2 in Science & Mathematics ➔ Biology
http://www.google.com/search?hl=en&q=How+did+the+eye+evolve%3F&btnG=Google+Search
This question has been anwered so many times in Answers already. Do your own work
2006-09-05 22:54:14 · answer #1 · answered by Caveman 4 · 1⤊ 0⤋
Slowly, over a long period of time. Clearly any sort of sight is better than not being able to see at all, so when light sensitive cells first appeared (totally accidently) they were on to a winner!
As with all evolutionary processes, chance mutations in an organisms dna changed the structure of the eye. Even though the changes might have been tiny, if they helped a creature to see they would be more likely to be passed onto the next generation. And those tiny changes add up - computers have simulated the evolution of a rather human-like eye starting from single light sensitive cells in about 10,000 generations. And the important thing to remember is that each one of those 10,000 eyeballs was better than the previous one. Creationists ask "what use is half an eye? clearly it couldn't evolve!" but the answer is that the creatures in generation 5,000 didn't have half an eye, they had an eye that worked half as well.
2006-09-06 08:56:32 · answer #2 · answered by robcraine 4 · 0⤊ 0⤋
First there were light-sensitive cells as we know them from plants and primitive animals. Arrays of many such cells allows an animal to gauge the direction the light is comming from. Such an array gets more effective (and better protected) if it's located in a "canyon" on the body surface, so the they got deeper and deeper.
2006-09-06 05:54:41 · answer #3 · answered by helene_thygesen 4 · 1⤊ 0⤋
The hairy eye?
2006-09-06 05:53:06 · answer #4 · answered by Anonymous · 1⤊ 1⤋
Very slowly.
2006-09-06 05:49:05 · answer #5 · answered by Absinthy 3 · 1⤊ 0⤋
http://www.simonyi.ox.ac.uk/dawkins/WorldOfDawkins-archive/Dawkins/Work/Articles/1995-06-16peepers.shtml
2006-09-06 08:23:34 · answer #6 · answered by kirun 6 · 1⤊ 0⤋
Have you lost your mind?!!!
2006-09-06 05:54:31 · answer #7 · answered by tracy211968 6 · 0⤊ 1⤋