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- transformation of an organism such that descendants differ from their predecessors
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
- theory that all living things have undergone, and do undergo, gradual changes through successive generations; that all living organisms are constantly changing (evolving)
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- The long-term process through which a population of organisms accumulats genetic changes that enable its members to successfully adapt to environmental conditions and to better exploit food resources.