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#124631 - 02/28/06 02:03 AM
Re: Creation or evolution
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Silver Star Soulmate
Registered: 10/20/04
Posts: 5563
Loc: US
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Here's another example of within-our-lifetime evolution.
In 1937, a batch of sockeye salmon were added to Lake Washington in Seattle. By 1992, the fish had formed into two distinct groups that looked different from each other and would not interbreed. This is the definition of separate species, and indeed scientists have given one of the fish groups a new name!
While all of the initial fish were from the same species, when they arrived in Lake Washington, one portion of the school decided to settle near a beach. They laid their eggs along the beach and began to evolve to fit in well with their beach-side existence.
The second group chose instead to move into the nearby river that feeds the lake. Because their breeding ground was in a fast-moving river, their breeding techniques as well as their appearance both began to change to suit this different environment.
In only just over 50 years, those two environments were having a serious effect on the two groups of fish. Not only were physical changes obvious between the two groups, but also the groups did not interbreed at all any more. The river-breeding fish did not try to intermingle with the beach-breeding fish.
The salmon are now the object of much research, as scientists track the changes between them, and watch as the two groups become more and more distinct from each other.
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Lisa Shea, Owner
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#124634 - 03/02/06 04:33 AM
Re: Creation or evolution
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Silver Star Soulmate
Registered: 10/20/04
Posts: 5563
Loc: US
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OK so far there appear to be no creationists out there. We can certainly talk about Intelligent Design then - but please if a creationist visits this thread PLEASE post your thoughts because I'd love to talk.
OK, so Intelligent Design. Let's talk about the dog family because we all know what dogs look like, it's an easy thing to visualize. We also all know that dogs all came from "common dog stock" - i.e. at one point there weren't dachshunds and dalmatians and so on. There was just a "dog" that we then bred for different uses. We bred sheepdogs to herd sheep, foxhounds to go after foxes and so on.
We have a ton of fossil records for dogs and wolves. We know that about 20 million years ago was when we had a recognizeable "dog" creature, and that later on different groups in different areas evolved into wolves, human-loving dogs, etc.
So can we agree that 20 million years is a VERY long period of time, and that surely in 20 million years, dogs could - depending on where they happened to live - develop different traits? I don't mean like one dog in one spot "changed". I mean that a group of dogs living in Alaska might have the less furry ones die off, and the more furry ones survive, and that after 20 million years, only really furry ones would be around ...
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Lisa Shea, Owner
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#124637 - 03/02/06 10:37 AM
Re: Creation or evolution
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True Blue Soulmate
Registered: 12/16/04
Posts: 22732
Loc: UK
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I found this: 'Dogs, ungulates (hoofed mammals), cats, bears, weasels, raccoons, civets and hyenas all share a common ancestor. Thus, the wolf and the animals it preys upon (the ungulates) evolved from a common ancestor from which they both inherited their intelligence and their ability to run swiftly for long periods of time. This common ancestor lived about a hundred million years ago.'It's from this page; http://canidae.ca/EVOLUTIO.HTM I don't know who the author is, but it seems well-researched. Have a look for yourselves and see what you think. This site, which I haven't checked out, looks as if it might be interesting: http://www.talkorigins.org/origins/faqs-evolution.html
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"The secret of success is constancy to purpose" - Benjamin Disraeli.
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