4 Water and Civilization 1

4 Water and Civilization 1 - Could not eat other organisms...

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Water, Life, Humans, and Civilization
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Must survive in low-oxygen environments Could not eat other organisms for food The First Organisms Two energy sources: Light and Chemical reactions Light: photoautotrophs Chemical reactions: chemoautotrophs Assemble complex carbon compounds from simple Carbon compounds (CO 2 ) using external energy.
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The First Organisms The First organisms: Chemoautotrophs (Fe and S) microtubes in pillow lavas containing residual carbon Evidence: Light: photoautotrophs Chemical reactions: chemoautotrophs
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Must survive in low-oxygen environments
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Unformatted text preview: Could not eat other organisms for food The Early Organisms Photosynthesizers: photoautotrophs Blue-green algae/cyanobacteria- Removal of carbon dioxide- production of oxygen Earliest: Main effects: The Early Organisms Oldest macroscopic life: stromatolites Cyanobacteria colonies sediments Produced billions of tons of O 2 Stromatolites Oxygen O 2 combined with iron No immediate increase in atmospheric O 2 Colonization of land: Ozone Layer Screens harmful UV radiation Ozone Function: First land plants 480 mya...
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