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Periodic Extinctions of Varying Amplitude (percent extincted)

Periodic Extinctions of Varying Amplitude (percent extincted). Mass Extinctions and Evolution. ½ to 2/3 of all species are eliminated during big events Plankton in the ocean is nuked So both the land and water are effected

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Periodic Extinctions of Varying Amplitude (percent extincted)

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  1. Periodic Extinctions of Varying Amplitude (percent extincted)

  2. Mass Extinctions and Evolution • ½ to 2/3 of all species are eliminated during big events • Plankton in the ocean is nuked • So both the land and water are effected • Encephelization Levels (EL) in organisms measure the amount of brain tissue in excess of that needed for basic metabolism maintenance

  3. Evolution of Intelligence? • This diagram has many features: EL Doubling time About 2 MY Unaltered EL Evolution would have produced “humans” 60 MYA Last 200 million years has constant slope Fastest Growth: 600-250 MYA; beginning of sea to land migration

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