Quote:
Originally Posted by CSchultz
Well, then we could use the example of the human eye, the retina, pupil, iris, cornea, lens, optic nerve, 137 million special light sensitive cells, rods and cones. If each and every one of these systems and subsystems are not fully functional and in place, the entire eye simply will not work.
In my view, to believe that each one of these systems evolved simultaneously even though each was meaningless and useless prior to the completed eyeball contradicts the theory of natural selection.
In other words, each of these systems would have been useless for millions and millions of years and therefore should have disappeared over time.
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Darwin himself proposed a speculation on how the eye could have evolved. And a quote from that explanation, taken out of context, has been used to promote the idea that the eye is impossible to evolve.
There actually a quite simple step by step explanation for the evolution of the eye starting with a flat piece of light sensitive skins. The creature benefits from the light sensitive skin being in a depression because it allows the direction of lights to become clearer (this is still used by some flatworms to this day). Clear liquid within the depression allows for more focused eye sight as well, and as part of this liquid becomes denser it continues to increase the focusing (eventually becoming the lens). All the while, this eye is functional. The cornea can form in stages as well, each step helping protect the eyes from small particles and bending light a little more (so the image will be more focused). The iris can form in slow steps as well, since any amount of expanding muscle would help for better light control so it gets better images in a wider variety of environments.
I'm not too knowledgeable in the subject so sorry if I'm not explaining it well. But it is possible.
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