[2] The Origins of Life I

[2] The Origins of Life I - C Paleozoic era packed with...

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Lecture 2 – The origins of life II I. The Oxygen Revolution A. Stromatolites create an oxygen rich atmosphere 1. Oxygen toxic to most existing prokaryotes II. From Prokaryote to Eukaryote A. The Endosymbiotic model (Lynn Margulis) a. Evidence for the endosymbiotic model III. From single cell to multicellular Eukaryote A. 1.5 BYA B. Allows for the evolution of cellular specialization (i.e. tissues) IV. The Cambrian Explosion A. 550 MYA the number of biological orders increases exponentially B. Burgess Shale fossils V. Geologic Time A. -. Eons -. Eras -. Periods -. Epochs B. Cambrian explosion occurs at the beginning of the Paleozoic Era
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Unformatted text preview: C. Paleozoic era packed with biological novelty (e.g. formation of bony fish, insect/ plant invasion onto land, etc) C. Mesozoic – age of reptiles D. Cenozoic – age of mammals VI. Plate tectonics – dynamic earth A. Pangea (Paleozoic) a. Gondwana (Mesozoic) b. Laurasia (Mesozoic) VII. Mass extinctions A. Three major mass extinctions at beginning of Paleozoic, Mesozoic and Cenozoic eras (other minor mass extinctions occurred) B. Probable cause of Cenozoic extinction – meteorite impacting Yucatan Peninsula...
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This note was uploaded on 04/19/2008 for the course BSC 2011 taught by Professor Fedorka during the Spring '08 term at University of Central Florida.

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