Chap26new - History of life on Earth The history of life...

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History of life on Earth History of life on Earth The history of life spans five intervals of geologic time
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Outline Outline Key concepts One can view the history of life as a phylogenetic tree. The geologic record Mass Extinctions History of Life Key terms Conclusions
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Key Concepts: Key Concepts: Life originated more than 3.8 billion years ago All of the compounds necessary for life could have formed spontaneously under conditions that existed on the early Earth The history of life spans five intervals of geologic time
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Key Concepts: Key Concepts: Divergence led to two prokaryotic lineages and to the eukaryotic divergence Certain environmental insults have had profound impacts on the direction of evolution
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One can view the history of life as a phylogenetic tree.
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The The geologic geologic record record
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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
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Chap26new - History of life on Earth The history of life...

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