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History of Life

History of Life. Emergence 3/25/08. History of Life. 3.9 – 2.5 Ma Chemoautotrophic prokaroytic cells (chemical evidence only) 3.5 Ma estimated lifetime of Last Universal Ancestor 3.0 Ma Cyanobacteria (photosynthesizers) 2.1 Ma Eukaroytes Present (Red Algae)

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History of Life

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  1. History of Life Emergence 3/25/08

  2. History of Life • 3.9 – 2.5 Ma Chemoautotrophic prokaroytic cells (chemical evidence only) • 3.5 Ma estimated lifetime of Last Universal Ancestor • 3.0 Ma Cyanobacteria (photosynthesizers) • 2.1 Ma Eukaroytes Present (Red Algae) • 1.2 Ma Sexual Reproduction Evolves (Green Algae) • 850 – 630 Ma Snowball Earth • 580 – 542 Vendian Biota (Ediacara) • 580 – 500 Cambrian Explosion • 540 Ozone layer forms

  3. Cyanobacteria: Stromatolites (3.4 – 2.7 Ba)

  4. Eukaryotic Fossils and Sex (1.2 Ma) Bitter Springs Formation, Australia

  5. Snowball Earth (800-600 Ma)

  6. Snowball Earth (800-600 Ma)

  7. Ediacaran Fauna Vendian Biota (580 Ma)

  8. Fossil Embryos

  9. Burgess Shale Fauna Organisms of the End Cambrian Explosion (540 Ma)

  10. Polycheates Velvet Worms Priapulid Worms

  11. Chordates: Pikaia Sponges Trilobites

  12. Anomalocaris

  13. Opabinia Marrella

  14. Hallucinogenia Wiwaxia

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