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4_EvolutionDebate

4_EvolutionDebate - The Case For and Against Evolution Ch...

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1 The Case For and Against Evolution Ch. 22.3 + R1 (on Blackboard) "Both sides ought to be properly taught . . . so people can understand what the debate is about…” George Bush, 2005 2 3 4 “Nothing in biology makes sense except In the light of evolution -Theodosius Dobzhansky, 1973 BISC 120 5 Arguments against evolution 6 Argument: Evolution cannot be observed and therefore cannot be proved
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2 7 Rebuttal: Evolution is observed all the time! 8 9 Rebuttal cont’d: We cannot observe the entirety of evolution and therefore rely on diverse lines of evidence, just as we do in other fields of science 10 Argument: There are no transitional fossils 11 “…Why, if species have descended from other species by fine gradations, do we not everywhere see innumerable transitional forms?” -from The Origin chapter entitled Difficulties on Theory 12 Rebuttal: The fossil record is spotty, but there are transitional forms Ex)Transition between fish and amphibians Acanthostega
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3 13 Ex) Transition between bird and reptile Archeopteryx Ex) Transitions between horse species 15 Ex) Transition from terrestrial ancestor to whale 16 Argument: Chance cannot create complexity 17 18 Rebuttal: Mutations are random (mostly). Selection is not.
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4 19 Argument: The first step toward complex adaptations could not have been favored 20 To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different
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