History of life on Earth - History of life on Earth The...

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1 History of life on Earth History of life on Earth The history of life spans five intervals of geologic time Outline Outline c Key concepts c One can view the history of life as a phylogenetic tree. c The geologic record c Mass Extinctions c History of Life c Key terms c Conclusions Key Concepts: c Life originated more than 3.8 billion years ago c All of the compounds necessary for life could have formed spontaneously under conditions that existed on the early Earth c The history of life spans five intervals of geologic time
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2 Key Concepts: c Divergence led to two prokaryotic lineages and to the eukaryotic divergence c Certain environmental insults have had profound impacts on the direction of evolution c One can view the history of life as a phylogenetic tree. The The geologic geologic record record
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3 1. The Archean Era (4600-2500mya): Oxygen- producing cells appear 2. The Proterozoic Era (2500-540mya): The first eukaryotes appear 3. The Paleozoic Era (542-250mya): The occupation
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This note was uploaded on 02/16/2010 for the course BIO 49970 taught by Professor Chinnery during the Spring '10 term at University of Texas at Austin.

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History of life on Earth - History of life on Earth The...

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