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2 15 10 Evolution Patterns

2 15 10 Evolution Patterns - Georgia Tech School of Biology...

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Georgia Tech School of Biology Spring 2010 Biology 1510 What factors are associated with major radiations and extinctions? How does an understanding of geological history explain distribution of past and current species? What is the tempo of evolutionary change? Patterns of evolution
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Georgia Tech School of Biology Spring 2010 Biology 1510 Environmental & Planetary Factors Continental drift – this would lead to the distribution of species Weather paterns Sea levels Bolide impacts: meteorites, asteroids Natural disaster: volcanic activity O2 levels (pollution) Global temperature Glacial movements
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Georgia Tech School of Biology Spring 2010 Biology 1510 http://www.globalwarmingart.com/wiki/Image:Phanerozoic_Sea_Level_png Phanerozoic Sea Level
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Georgia Tech School of Biology Spring 2010 Biology 1510 At the start of the Cambrian 520 Mya, atmospheric oxygen levels were A. Less than 0.1% of present-day levels B. About 1% of present-day levels C. About 10% of present-day levels D. About the same as present-day levels E. Higher than present-day levels
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Georgia Tech School of Biology Spring 2010 Biology 1510 Cambrian Radiation
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