AncientLifeMetab

AncientLifeMetab - ORIGIN OF METABOLISM What was the earliest life and where did it get its energy Geological stratigraphy together with

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ORIGIN OF METABOLISM What was the earliest life and where did it get its energy?
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Last impact heating ~3500 Geological stratigraphy, together with radioactive dating, show the sequence of events in the history of the Earth. Note the entry for “cyanobacteria” and “stromatolites” only one billion years after the formation of the Earth.
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“The oldest actual fossils of microbial life date back some 3.6 to 3.5 billion years, which is a few hundred thousand years after the first chemical signs of life occurred. These fossils consist of delicate chains of microbes that look exactly like blue-green bacteria. ..or cyanobacteria, which are still in existence today.” (Niele, p. 8) Were there actually living cells present 3.6 billion years ago? Did they form stromatolites? Were they cyanobacteria? If they were not cyanobacteria, what were they?
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Stromatolites are layered rocks formed under thin microbial mats. Cyanobacterial mats: primarily Microcoleus chthonoplastes Stromatolites in Hamelin Pool, Shark Bay, Western Australia
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Stromatolites can be recognized by their layered appearance. More stromatolites in Hamelin Pool, Shark Bay, Western Australia
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Stromatolite from the
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This note was uploaded on 06/18/2010 for the course BIS 103 taught by Professor Abel during the Spring '08 term at UC Davis.

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AncientLifeMetab - ORIGIN OF METABOLISM What was the earliest life and where did it get its energy Geological stratigraphy together with

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