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3 Water and Life 4 - macroscopic evidence of life on Earth...

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Embedded in the lava are numerous tubular structures left behind by ancient microbes Evidence for Earliest Organisms Chemoautotrophs ~ 3.5 bya tubes contain carbon that represents organic material left behind by early organisms. Iron Sulfur
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Cyanobacteria Photosynthetic 2.5 – 3.0 bya 6CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 light Fix carbon dioxide into complex organic compounds. (Simplified) - removed carbon dioxide - production of oxygen (Blue-green algae) Photoautotrophs Microscopic
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Stromatolites Colonies of Photosynthetic Cyanobacteria The oldest
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Unformatted text preview: macroscopic evidence of life on Earth, at least 2.5 billion years old turfs Stromatolites Cyanobacteria colonies sediments Effect? Produced billions of tons of O 2 Increase in atmospheric O 2 ? Cyanobacteria colonies Ammonium Carbon Dioxide Hydrogen Helium Water Vapor Oxygen = 0.21% Oxygen Little Alteration of the Earth’s Atmosphere Photosynthesis 6CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 Billions of tons of oxygen Iron Iron oxide Does not dissolve in water: insoluble...
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