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The extinctions, however, did not conform to the usual evolutionary rules regarding who survives; the only factor that appears to have improved a family of organisms’ chance of survival was widespread geographic colonization at the time of the event.
“mass extinction,” in The Columbia Encyclopedia, 6th ed., ed. Paul Lagassé (New York: Columbia University Press, 2003). Also available online at http://education.yahoo.com/reference/encyclopedia/entry?id=30472.
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