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Evolution
Sources Select Resources Encyclopedia

http://www.sources.com/SSR/Docs/SSRW-Evolution.htm

Publisher:  Wikipedia
Resource Type:  Article

In biology, evolution is change in the genetic material of a population of organisms through successive generations. Although the changes produced in a single generation are normally small, the accumulation of these differences over time can cause substantial changes in a population, a process that can result in the emergence of new species. Similarities among species suggest that all known species descended from a common ancestor (or ancestral gene pool) through this process of gradual divergence.

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