Life on Earth - The Infinite Variety

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Life on Earth - The Infinite Variety
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From: silichip
Videos: 2007
Added: 06-12-2010 18:35:32
E01 - David Attenborough - 1979 - The first episode begins in the South American rain-forest, whose rich variety of life forms is used to illustrate the sheer number of different species. Since many are dependent on others for food or means of reproduction, David Attenborough argues that they couldnt all have appeared at once. He sets out to discover which came first, and the reasons for such diversity. He starts by explaining the theories of Charles Darwin and the process of natural selection, using the giant tortoises of the Galapagos Islands (where Darwin voyaged on HMS Beagle) as an example. Fossils provide evidence of the earliest life, and Attenborough travels a vertical mile into the Grand Canyon in search of them. By the time he reaches the Colorado River bed, the geological strata are 2,000 million years old there are no fossils. However, the
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