From: David Rudiak <drudiak.nul> Date: Mon, 17 Dec 2012 12:01:04 -0800 Archived: Tue, 18 Dec 2012 07:10:00 -0500 Subject: Re: Convergent Evolution >From: Edward Gehrman<egehrman.nul> >To:<post.nul> >Date: Sun, 16 Dec 2012 12:55:58 -0800 >Subject: Convergent Evolution >List, >This is an interesting article on convergent evolution. Humans >occupy the "tool making and using" niche. That means that >another species that opted to travel along the tool-making path >would end up looking very much like humans. >http://tinyurl.com/cw8x3br >"However, when University of Queensland researcher Bryan Fry and >colleagues tested the serpentine DNA, the results showed that >they were separate species, and not even close relatives... This >is a case of convergent evolution, wherein different species >evolve independently but end up looking quite similar... Or, as >Yong put it, convergent evolution is 'when different species >turn up at life's party wearing the same clothes'." Ed, the article is about convergent evolution of two species of sea snakes, not about tool making species. While I would agree that a good case could be made that technological, space-faring, non-human beings of very separate evolution might very well be humanoid in appearance, including hands, for convergent evolutionary reasons, you are making a huge extrapolation to that from an article on sea snakes. My favorite examples of convergent evolution are ancient reptilian ichthyosaurs and modern mammalian dolphins, which evolved 150 million years apart, yet occupied the same ecological niche (ocean predators) and have an extraordinary similar appearance. The similarities go beyond that, including both giving birth to live young and being land animals that returned to the sea. I recently visited Ichthyosaur State Park in the middle of Nevada located at 7000 feet elevation, which has a hillside of exposed ichythosaur skeletons, some up to 70 feet long. I asked the guide how they could end up in central Nevada, and he responded that 200 million years ago central Nevada was the western edge of the super continent of Laurasia before North America split off from Europe/Asia. In the intervening 200 million years, California and western Nevada "accumulated" on the western edge of North America where ichythosaurs once frolicked in the shores of the ancient Pacific Ocean. All of this is very mind-blowing. I think we all have trouble grasping these vast expanses of time and the great changes that can happen in such time expanses. And this represents less than 5% of the history of Earth. David Rudiak Listen to 'Strange Days... Indeed' - The PodCast At: http://www.virtuallystrange.net/ufo/sdi/program/ These contents above are copyright of the author and UFO UpDates - Toronto. They may not be reproduced without the express permission of both parties and are intended for educational use only.
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