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2 Origins of Water 7 - Energy from Chemical Reactions...

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Ammonium Carbon Dioxide Hydrogen Helium Water Vapor Organisms and the Earth’s Early Atmosphere Must survive in low-oxygen environments Could not eat other organisms for food
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Anaerobic: live in low-oxygen environments Autotrophic: produce complex organic compounds from simple carbon-containing molecules and an external source of energy. The Earliest Organisms (Organic = carbon-rich or carbon-based) Auto – Self Trophic – Feeding
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Photoautotroph A photoautotroph is an organism that assembles complex organic compounds from simple carbon-containing molecules using energy from light . Complex organic compounds Simple inorganic molecules: CO 2 Photo = light Plants Photosynthetic Bacteria Photosynthetic Algae
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Chemoautotroph A chemoautotroph is an organism that produces complex organic compounds from simple carbon-containing molecules using energy from chemical reactions
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Unformatted text preview: Energy from Chemical Reactions Zinc/manganese Sulfur/potassium nitrate Chemoautotroph A chemoautotroph is an organism that produces complex organic compounds from simple carbon-containing molecules using energy from chemical reactions simple inorganic molecule CO 2 Iron Sulfur Chemical Reactants (energy) complex organic compounds Embedded in the lava are numerous tubular structures left behind by ancient microbes Earliest Organisms Chemoautotrophs ~ 3.5 bya tubes contain carbon that represents organic material left behind by the early organisms. Iron Sulfur Cyanobacteria Photosynthetic 2.5 – 3.0 bya 6CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 light Fix atmospheric carbon dioxide into complex organic compounds. (Simplified)- removed carbon dioxide- production of oxygen (Blue-green algae) Photoautotrophs Microscopic...
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