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— Herbert Spencer"Organs, faculties, powers, capacities, or whatever else we call them; grow by use and diminish from disuse, it is inferred that they will continue to do so. And if this inference is unquestionable, then is the one above deduced from it-that humanity must in the end become completely adapted to its conditions-unquestionable also. Progress, therefore, is not an accident, but a necessity."
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During cycles long anterior to the creation of the human race, and while the surface of the globe was passing from one condition to another, whole races of animals-each group adapted to the physical conditions in which they lived-were successively created and exterminated.
— Roderick Murchison
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The secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and time for a long succession of small mutations.
— Carl Sagan
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