Lecture_9 - Biogeochemical Cycles Evolution ISB 201 Section...

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Biogeochemical Cycles & Evolution ISB 201 Section 001 Feb. 10, 2009
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The Atmosphere
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Atmosphere Changed Through Earth’s History 4.6 BYA - H 2 and He • H 2 O, CO 2 , SO 2 , CO, S 2 , Cl 2 , N 2 , H 2 , NH 3 , CH 4 (Volcanic gases) 2.8 BYA O 2 (previous date 2.2-2.5 BYA)* Current atmosphere, from from Lutgens and Tarbuck, The Atmosphere , 8th edition *the Great Oxidation Event
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Fig. 12-6, p. 267 Metamorphic rock Slate, marble, gneiss, quartzite Melting Magma (molten rock) Cooling Granite, pumice, basalt Weathering Erosion Transportation Deposition Heat, pressure Heat, pressure, stress Sandstone, limestone Sedimentary rock Igneous rock Rock Cycle
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Evolution
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The Theory of Common Descent. All organisms present on Earth today are descendents of a single common ancestor, and all organisms represent the product of millions of years of microevolution.
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History of the Theory: BD** Aristotle Father of biology, essentialism Ignored variation, considered it imperfection Scala Naturae = “ladder of life”, “great chain of being” Species immutabale Linear scale of complexity 2000 years of prevalence **Before Darwin
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History of the Theory: BD** Georges Cuvier (1769-1832) Geological layers of fossils Species disappear and appear in the fossil record Organisms were designed as perfect whole beings Cuvier (1872) Essay on the Theory of the Earth **Before Darwin
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History of the Theory: BD** Jean Baptiste Lamark (1744-1829) First mechanism for evolution Inheritance of acquired characters Species immutable
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