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David Attenborough - First Life
David Attenborough - First Life 01 - Arrival

David Attenborough's First Life - Part 1 par Vierotchka
David Attenborough - First Life 02 - Conquest

David Attenborough - Blue Planet »

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 From Wikipedia

David Attenborough

First Life
Episode One

 Arrival

 In modern, still somewhat limited understanding, the first living things on Earth are thought to be single cell prokaryotes (which lack a cell nucleus), perhaps evolved from protobionts (organic molecules surrounded by a membrane-like structure). The oldest ancient fossil microbe-like objects are dated to be 3.5 Ga (billion years old), approximately one billion years after the formation of the Earth itself. By 2.4 Ga, the ratio of stable isotopes of carbon, iron and sulfur shows the action of living things on inorganic minerals and sediments and molecular biomarkers indicate photosynthesis, demonstrating that life on Earth was widespread by this time.

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