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David Attenborough - Life On Earth
Life on Earth - 01 - The Infinite Variety
Life on Earth - 02 - Building Bodies
Life on Earth - 03 - The First Forests
Life on Earth - 04 - The Swarming Hordes
Life On Earth - 05 - The Conquest Of The Waters
Life On Earth - 06 - The Invasion Of The Land
Life On Earth - 07 - Victors Of The Dry Lands
Life On Earth - 08 - Lords Of The Air
Life On Earth - 09 - The Rise Of The Mammals
Life On Earth - 10 - Theme And Variation
Life On Earth - 11 - The Hunters And Hunted
Life On Earth - 12 - LIfe In The Trees
Life On Earth - 13 - The Compulsive Communicators

« David Attenborough - Life Of Mammals

David Attenborough - Lost Worlds Vanished Lives »

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From Wikipedia

 David Attenborough

 Life on Earth

Episode One
The Infinite Variety

Broadcast 16 January 1979, the first episode begins in the South American rainforest, 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 couldn't 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 — yet there are no fossils. However, the "right rocks" are found on the shores of Lake Superior in Canada, where wafer-thin slices of flint, called chert, reveal filaments of primitive algae. Also, the micro-organisms that flourish at Yellowstone Park in Wyoming appear to be identical to the Earth's oldest fossils. The evolution of single-celled creatures, from simple cyanophytes to more complex ciliates, and then from multi-celled sponges and jellyfish to the many variations of coral and its associated polyps, is discussed in detail. The fossilised remains of jellyfish are shown within the Flinders Ranges of Australia, and are estimated to be 650 million years old.

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