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Unformatted text preview: nature do the selecting. 6. Because individuals possessing favorable characteristics contribute more offspring to the next generation than do others, over time, such traits become more common in the population, less favorable traits are not passed on as frequently and become less common. 7. Over long periods of geological time, successful variations accumulate in a population, so that later generations may be distinct from ancestral ones. 8. Geological isolation may also lead to the formation of new species. As populations of a species become geologically isolated from one another, for whatever reason, they adapt to different environments. Example: the 13 species of Galapagos finches, descended from a common ancestor on the South American mainland....
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- Spring '11