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Fossils: Cuvier and lamarck
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Discrete Genes Are Inherited: Gregor Mendel
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Natural Selection: Charles Darwin Alfred Russel Wallace
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Random Mutations and Evolutionary Change: Ronald Fisher, JBS Haldane and Sewall Wright
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Speciation: Ernst Mayr
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DNA, the Language of Evolution: Francis Crick and James Watson
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Evolution and Development for the 21st Century: Stephen Jay Gould