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History of Life 1

History of Life 1 . Tucson Botanical Gardens. Brian O ’ Meara EEB464 Fall 2013. Learning outcomes:. Get a deep perspective on time Understand major events in earth history Generate hypotheses regarding what happens after mass extinctions. Big Bang 13.73 BYA.

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History of Life 1

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  1. History of Life 1 Tucson Botanical Gardens • Brian O’Meara • EEB464 Fall 2013

  2. Learning outcomes: • Get a deep perspective on time • Understand major events in earth history • Generate hypotheses regarding what happens after mass extinctions

  3. Big Bang 13.73 BYA

  4. First stars produce more complex elements, then (some) explode

  5. Borb

  6. Solar system (sun, planets) form 4.6 BYA

  7. Ow! Moon broken off from Earth, 4.53 BYA

  8. Heavy bombardment, 4.1 - 3.8 BYA

  9. Life evolves ~3.8 BYA

  10. O C O O H H Photosynthesis evolves somewhere 3.5 - 2.8 BYA O + = + Sugar O

  11. O C O O H H Great oxidation event 2.45 - 2.22 BYA O + = + Sugar O

  12. Huronian glaciation 3.2 - 2.4 BYA

  13. a long time passes Archaea+Eukaryotes and Eubacteria diverge Eukaryotes diverge from Archaea Life is still single-celled Andree Valley

  14. http://www.youtube.com/watch?v=9w421z4fsOU

  15. a long time passes Archaea+Eukaryotes and Eubacteria diverge Eukaryotes diverge from Archaea Life is still single-celled Andree Valley

  16. Ediacaran fauna 0.63 BYA = 630 MYA Wikimedia commons

  17. Cambrian 542 MYA John Sibbick

  18. Wikimedia commons

  19. Permian-Triassic extinction 251 MYA

  20. Permian-Triassic extinction 251 MYA

  21. Permian-Triassic extinction 251 MYA

  22. KT (Cretaceous-Tertiary) extinction 65.5 MYA Brian Franczak

  23. Life goes extinct Life evolves Multicellularity NOW Sun eventually becomes red giant, expands Franck et al. Causes and timing of future biosphere extinctions. Biogeosciences (2006) vol. 3 (1) pp. 85-92 Schröder and Smith. Distant future of the Sun and Earth revisited. Monthly Notices of the Royal Astronomical Society (2008) vol. 386 (1) pp. 155-163

  24. Discussion: how might a major extinction like the one at the end of the Permian affect life?

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