Unfortunately, since snakes tend to be rather delicate, there are not too many fossils from the period of about 200 million years ago that directly illustrate the evolutionary process of lizard to snake. Most of the evidence in the field is based on cranial morphology and genetic analysis of living members of the groups. There is considerable debate in the field as to exactly how and from which group of lizards the snakes evolved.
So you are unlikely to find the nicely illustrated step-by-step progression of lizard to snake the way you will for groups like horses, whales or humans.
Here's a paper that shows a very nice cladogram of the molecular genetic evidence linking snakes and marine lizards http://www.journals.royalsoc.ac.uk/media/bav0qlrqqq3vd7j5nre7/contributions/j/7/9/4/j794lwa5nhtpqjuf.pdf
Here's a page that shows some modern lizards that are displaying adaptations towards elongation and leglessness that the snakes also went down, but these lizards are definitely NOT 'turning into snakes' - it's an example of convergent evolution.
http://www.dimaggio.org/Evolution/biologic.htm
2007-02-22 11:46:48
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answer #1
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answered by Anonymous
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You decided you didnt believe that monkeys evolved in to humans? Well I'm afraid you're likely to flunk biology.
Evolution isn't about belief - its about the facts, you either understand them or you dont.
We didn't 'evolve from monkeys' - if you have any understanding of evolutionary biology at all you’d be able to tell that the question makes no sense – humans and monkeys have both evolved from a common ancestor approximately 40 million years ago.
Rephrased in these terms it would be like you saying 'If I had a common grandfather with my cousin, why do my cousins still exist?'
You see? Phrased like that you begin to see the holes in the theory – the assumption that human kind are the 'point' of evolution - only religious people make that mistake. The question is probably more devastating when asked to a religious person – if we were all created why are there monkeys? They can’t explain the purpose of an animal other than man which is not man’s food or servant because they believe the Universe was made for them only.
Neo-darwinists can easily explain why there are other animals, because that’s just what you’d expect to see, with branching trees that show evolutionary relationships and these are of course, genetic relationships. What do you think it means to say that you’re a mammal? It means you have a common ancestor with all other mammals more than 200,000,000 years ago! You might as well ask if we came from dust, why is there still dust? If you’re honest with yourself, it’s easy to see which theory of our origins is based on reality and which is a merely a pre-scientific allegory from bronze-age humans. Science doesn’t ask you for any faith. Go to a museum, examine the evidence for yourself. Draw whatever conclusions you think make sense and be critical.
Biologists have understood and accepted since Victorian times that we're not the destined pinnacle of evolutionary adaptation, just an unexpected adaptation, one minor twig on the branch that is Mammalia. The Universe may not have a purpose for us, but we can make our own.
Kind Regards.
2007-02-23 00:52:58
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answer #2
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answered by Leviathan 6
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maximum scientists have faith that snakes more advantageous from lizards. There are legless lizards and a few snakes have small protrusions that recommend they as quickly as had legs. i'm no longer precisely helpful why the top is that snakes got here from lizards and not any incorrect way around, yet i think the coolest judgment is that snakes have a lot extra more advantageous biology and are extra adaptable than maximum lizards.
2016-10-16 06:41:39
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answer #3
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answered by ? 4
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Careful, your cynicism is showing.
I would steer clear of science as a career if I were you, as you clearly dismiss evidence before it is understood.
But for your interest, snakes and lizards had a common ancestor. It is the reason that snakes have vestigial limbs.
Here is a link to some photos.
2007-02-22 09:39:18
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answer #4
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answered by Labsci 7
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there is no such thing as evolution. go to walmart, and buy the cheapest bible there is. open it, and in the begining of genesis, it says how the world and the animals are created
2007-02-22 12:54:38
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answer #5
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answered by Jonathan$$$ 3
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