lecturenotes2 - Nope - diversification and extinction here...

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Sheet1 Page 1 Nope - diversification and extinction here too Though there are here, as elsewhere, some reasonably slow, continuous changes Different time scales reveal different patterns, just as different space scales do Clumpiness understandable in terms of evolution, but (and) raises new questions Things similar because of common ancestry Non-existing things because didn't/can't work? because not tried? Evolution includes both slow, continuous change and rapid change The latter because exploring some possibilities depends on having explored prior possibilities? Would help explain how highly improbable things come into existence. Indicates very strong history dependence in accounting for life. Evolution involves "chance", and hence likely to proceed somewhat differently elsewhere or if repeated meteor collisions (and the like) dependence on random variation within biological systems Evolution does include some directionality, but is not toward "perfection" or "better" but rather toward having explored more (in c All existing organisms (including ones that have long evolutionary histories) equally adapted ("successful"). Need to account for patterns in space and time at multiple scales Improbable assemblies, adaptiveness, diversity, change Can get that from improbable assemblies of physical elements (atoms)? Remarkable generalization - dissociate ANYTHING, get out elements = atoms ElementSymbolAtomic numberPercent in universePercent in earthPercent in human hydrogenH1910.149.5 heliumHe29tracetrace carbonC60.020.0318.5 nitrogenN70.04trace3.3 oxygenO80.064765 sodiumNa11trace2.80.2 magnesiumMg12trace2.10.1 phophorusP15trace0.071 sulfurS16trace0.030.3 chlorineCl17trace0.010.2 potassiumK19trace2.60.4 calciumCa20trace3.61.5 ironFe26trace5trace Living, non-living assemblies not distinguishable by identity of constituents at atomic level Nor are different kinds of living things Living assemblies are distinctive in proportions of atomic constituents (improbable assemblies)
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This note was uploaded on 07/21/2011 for the course BIO 101 taught by Professor Staff during the Spring '08 term at Northern Virginia Community College.

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lecturenotes2 - Nope - diversification and extinction here...

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