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Unformatted text preview: evolution by natural selection? a. Selection is always strong, but the very limited amount of variation in populations means that evolutionary change is always slow. b. When selection is strong, large amounts of variation in sexual populations can allow evolutionary change to be very rapid. c. Because natural selection is a blind, purposless process, selection is always weak and evolutionary change is always slow. d. Because changing the anatomy or behavior of an organism is extraordinarily difficult, evolutionay change is always slow....
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- Spring '08