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Adaptive Evolution is driven by natural selection. Natural selection is not "survival of the fittest," but rather "reproduction of the fittest." Evolution can occur at many different speeds based on the strength of the selection driving it. Stearns, Stephen C. EEB 122, Principles of Evolution, Ecology and Behavior, Spring 2009. Yale OpenCourseWare: Ecology and Evolutionary Biology, Accessed 16/9/14 http://oyc.yale.edu/ecology-and-evolutionary-biology/eeb-122/lecture-3 License: Creative Commons BY-NC-SA

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