12-ch16-origins

12-ch16-origins - Chapter 16 (Origins of Diversity) Gustav...

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Chapter 16 (Origins of Diversity) Gustav Klimt, Tree of Life
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Geologic history 13 bya . ....... formation of universe (big bang) 10 bya . ....... formation of Milky Way galaxy 4.6 bya . ...... formation of our solar system 4.5 bya . ...... earth experiences frequent collisions with debris all water is vapor (no oceans yet) 3.8 bya . ...... origin of life on earth oldest fossils (3.5 bya) = stromatolites (bacterial mats)
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Early earth conditions were very different (incompatible with life in its current form) perhaps rich in Nitrogen, Carbon Dioxide molten surface or unstable crust no atmospheric Oxygen this came only after photosynthesis massive water vapor content constant volcanic eruptions nitrogen, nitrous oxide, carbon dioxide, methane, ammonia, hydrogen, hydrogen sulfide
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the right chemicals H 2 O Water CH 4 Methane CO 2 Carbon Dioxide H 2 Hydrogen NH 3 Ammonia N 2 Nitrogen were in the right place at the right temperature at the right time: organic molecules (primitive soup ) + massive energy (lightning, UV radiation?) + membrane-bound protobionts = first organisms How did life evolve on earth?
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.. attempt to mimic
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12-ch16-origins - Chapter 16 (Origins of Diversity) Gustav...

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