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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: TigerPaw who wrote (1399)	6/4/2006 5:04:10 PM
From: Brumar89	Read Replies (1) \| Respond to of 69300

That's a good example of "it must have been so" IMO: I noticed that the shape of the cells in the worm’s brain resembled the rods and cones in the human eye. I was immediately intrigued by the idea that both of these light-sensitive cells may have the same evolutionary origin.” ....“molecular fingerprints”. Such a fingerprint is a unique combination of molecules that is found in a specific cell. He explains that if cells between species have matching molecular fingerprints, then the cells are very likely to share a common ancestor cell. Re. the shape of cells, "molecular fingerprints", etc. - do these prove common ancestry - perhaps, perhaps not. But even so, what is it that has caused the changes from the ancestor to the present - only random mutation and natural selection? That should be at best an open question. -------------------------- Question - since you're speaking as an expert on the eye: two types of light-sensitive cells existed in our early animal ancestors: rhabdomeric and ciliary. In most animals, rhabdomeric cells became part of the eyes, and ciliary cells remained embedded in the brain. But the evolution of the human eye is peculiar – it is the ciliary cells that were recruited for vision which eventually gave rise to the rods and cones of the retina. The above says human eyes are different from the eyes of "most animals". What are the "most animals" whose eyes are different from ours? For example, do most mammals have eyes different from ours?