2006-07-12 07:00:19 · 8 answers · asked by dodgy plumber 1 in Science & Mathematics ➔ Biology
Depth perception is the key here man
2006-07-12 07:04:10 · answer #1 · answered by opilonies 2 · 0⤊ 1⤋
First, a few cells that were light sensitive, allowing the organism to move towards light.
Then the patches got bigger, and formed saucers that allowed it to better detect which direction the light came from.
These got deeper, and rounder, and the outer layer started to close over it so that it became like a "pinhole camera, with a clear directional function.
Then focus mechanism appeared, and the creature was able to "see" more than just light.
The process took millions of years, and can be traced in the fossil record.
2006-07-12 07:08:42 · answer #2 · answered by The Lone Gunman 6 · 0⤊ 0⤋
Without two eyes there is no depth perception. There proberly were some organisms with one eye but quickly died when they fought the predator/ prey was a lot closer/further than it was. Remeber Evolution is the survival of the fittest and fossils account for less than 0.0001% of the organisms that actually existed at the time.
2006-07-12 07:04:08 · answer #3 · answered by setsunaandkurai 2 · 0⤊ 0⤋
Organisms did not just evolve two eyes. As far as is known, organisms first developed light sensitive cells on patches of their exterior. Eventually the light sensitive areas concentrated in particular locations. Some mollusks such as scallops have primitive structures that resemble this concept. In their case they have not one by numerous such patches near the opening of their shells. As organisms evolved these patches gradually concentrated and moved to more central locations. So dual eyes have actually evolved not from two eyes but from many eyes
2006-07-12 07:12:32 · answer #4 · answered by Huey from Ohio 4 · 0⤊ 0⤋
Where on earth did you get the idea that organisms went straight from no eyes to 2 eyes? ... That some eyeless creature just gave birth one day to something with 2 complete camera-style eyes? No evolutionist believes that. Whoever gave you that idea is either deliberately mis-stating evolution in a ridiculous way in order to call it ridiculous ... or else they really don't understand evolution *at all*. (I.e. *please* get a different source of information if you sincerely want to understand it.)
*Of course* there is evolution between the two ... many, many, many intermediate forms of eyes ... most of which are still found in organisms alive today. ... From rudimentary eyespots in jellyfish and flatworms, to rudimentary cup-shaped eyes in some molluscs, on an on and on to camera-style eyes we see in vertebrates. As long as each intermediate development provides some slight advantage over previous forms, the eye will continue to evolve and get gradually better and better over millions of years.
Here's a link to another question in which, in my answer, I gave a long description of the intermediate forms. (It's a long description because it is a *loooong* process.)
http://answers.yahoo.com/question/index;_ylt=Ak6d9iTquj0_s2sCd0acrrHsy6IX?qid=1006052906325
BTW, the reason we have 2 eyes (instead of one or three) is partly due to the fact that two eyes have advantages, such as the ability to judge distance (for predators) or look laterally for predators (for potential prey), but also because we share the same bilateral symmetry body plan developed very early in our ancestry. I.e. it's the same reason we have two ears, or two kidneys, or two lungs, or two hemispheres in our brain. Our nervous system in particular (of which the eyes and visual system is a subset) is very bilaterally symmetrical.
2006-07-12 07:33:29 · answer #5 · answered by secretsauce 7 · 0⤊ 0⤋
Abelgladstone: We did not evolve from monkey or apes. That is not a tenet of evolution. Evolution says that monkeys and apes and humans evolved from a common anscestor.
This is the typical straw man that creationists use to attempt (and fail) to attack evolution.
2006-07-12 08:59:34 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The Box Jelly fish has an eye on each of its 4 sides but no brain to interpret the info recieved as an image. It responds to changes in light.
2006-07-12 07:07:16 · answer #7 · answered by sarah c 7 · 0⤊ 0⤋
evolution is itself nonsense dude!
If chipmpanzees became men few million years ago then why dont the present age monkeys get transformed to humans or the race of monkeys which are coming from a million years old.
Sorry if I hurt you or if you feel abused.
But the that is a bare truth many cant just understand..
2006-07-12 07:11:01 · answer #8 · answered by abelgladstone 2 · 0⤊ 1⤋