Ana writes:
What are the odds that the most simple eye could appear in one mutation? Not exact odds, surely, but generally speaking, is it something that science can speculate as possible?
Yes odds could probably be estimated, and since the eye has evolved independently several times the odds are probably pretty good.
Consider all that is required is for some cells to be come light sensitive and generate some sort of output to a nervous system for a response. Being able to detect light, however meager, is very useful on a planet where the Sun is the primary energy source.
Also light senstive cell would be useful in detecting a predators shadow. For example, starfish have a simple photoreceptor "eyespot" at the tip of each appendage. The eyespot only can detect differences of light and dark, which is useful in detecting movement and a possible foe.
Ana writes:
At the same time, if countless things get on without them, what is the sense in getting one?
The point is differental success. Surely you can see this.
Edited by iceage, : No reason given.
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