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Duration: 07:46 minutes Upload Time: 2007-03-29 08:00:42 User: Faidros86 :::: Favorites :::: Top Videos of Day |
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Description: What good is half an eye? OR how evolution can produce complex structures like human eye. |
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| randallsnowb ::: Favorites 2008-01-16 20:59:53 Good point. And what came first, the head or the light sensing cells? Or was it the nerves? Surely the light sensing cells needs nerves to send the signal to the brain or nervous system. __________________________________________________ | |
| messiahjonz ::: Favorites 2008-01-07 11:19:18 Because as an educated geologist I happen to follow scientific methodology. "The question is, how on earth did an animal evolve those (VERY complex) light sensitive cells? Wait, I bet I know the answer...it takes a billion years right?" This question is not valid scientifically. It is another of those painfully ignorant sarcastic yammerings that come up from the uneducated ranks. __________________________________________________ | |
| shady136 ::: Favorites 2008-01-07 01:51:12 And your judgment of what path a rational person should follow is based on....science?? Pfft...why should I listen to your path of rationale?? __________________________________________________ | |
| shady136 ::: Favorites 2008-01-07 01:46:30 Hmmm, how have I indicated that I am using non-scientific sources in any way? The question is valid and the video is vague. Try education yourself. __________________________________________________ | |
| messiahjonz ::: Favorites 2008-01-07 00:39:39 Instead of supposing or betting why things (the eye) are the way they are, why not educate yourself. Utilizing non scientific sources to explain nature and science is not the path a rational person should follow. __________________________________________________ | |
| ornithogotus ::: Favorites 2008-01-03 22:29:34 jkl;jkll;jkl;jkl;jkl;jkl;jjkk;kjl;ljlkj jj jkl;lll;lkkkl;;;;';l;lk;;kjbjbjbnjklll;lkkjhjhhhjkjl;lkjkl;jmkkjjkk'lkmklljkljkljkljkljkljkljljkljkljklj jkljkljkljkljkljkljkljkl __________________________________________________ | |
| shady136 ::: Favorites 2008-01-01 18:33:38 A flat patch of light sensitive cells...this whole stance is based POST that step. The question is, how on earth did an animal evolve those (VERY complex) light sensitive cells? Wait, I bet I know the answer...it takes a billion years right? __________________________________________________ | |
| twothlesswonder ::: Favorites 2007-12-29 23:32:13 "but it is impossible for 'a sack of jelly like substance' to form to create a lens" Science 28 July 2000: Vol. 289. no. 5479, pp. 522 - 523 Furthermore, the citation shows that the eyes development hinges on the lens. __________________________________________________ | |
| Jimraynor45 ::: Favorites 2007-12-23 01:34:34 well, the sack of jelly wouldnt have to be used for vision, it could have other uses. It could be used to simply detect electrical signals or something. then, each thing could be added on over time, while each piece could allow the eye to do different things. Its like building a engine, at first it doesnt produce power, all it does is make heat, as you add more pieces, its purpose can change. SO that eventually, it could do something like power a car. __________________________________________________ | |
| moderatethis ::: Favorites 2007-12-19 10:12:28 Yes, a single celled being can respond to stimuli without a CNS. Yes, this video makes SENSE, but it is impossible for 'a sack of jelly like substance' to form to create a lens - please explain how that could happen. You need the sack, the jelly... all in small steps. Doesn't make sense to me. __________________________________________________ | |
| MrFacet ::: Favorites 2007-12-11 10:15:17 What is needed for sensible actions is a receptor of stimuli (e.g. light, oxygen, gravity), some way of behavior (moving towards or away from the stimulus, encapsulate food). To connect these two there are several options. Beside the central nervous system or reflexes, you could also have communication within inside the cell. Take the amoeba: it can move with pseudopodia or ingest food. Without a CNS. __________________________________________________ | |
| moderatethis ::: Favorites 2007-12-11 09:23:52 What good is a receptor without a nervous system and a brain to interpret the signals in a beneficial way? __________________________________________________ | |
| MrFacet ::: Favorites 2007-12-10 15:29:03 Your proposal is likely from a book by American Christians trying to get creationism taught in science class, by making it look like a scientific theory, dubbed Intelligent Design. There are really clever reconstructions of eya and flagel evolution on talkorigins. But please start by reading a basic book on evolution by neutral biologist, as I think you ran into an ID book that usually presents strawman lies. __________________________________________________ | |
| MrFacet ::: Favorites 2007-12-10 15:17:57 The earlier mentioned book Climbing Mount Improbable does just that, inventorising the various paths the development of eyes took over the animal kingdom. With the proof you want. Suprisingly to some, the eye took many different ways to develop, I remember something like 38. And the eye of the octopus having a more clever design than ours is very very convincing. __________________________________________________ | |
| MrFacet ::: Favorites 2007-12-10 15:14:18 Of course they also had other senses, but I am replying because a membrane and an indentation are pretty easy to form in an embryo, due to the way it grows from one cell to a hollow ball to a twolayered ball and then bulging in to form organs and the neural system. __________________________________________________ | |
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