Gregory Courtney, Iowa State University (IMAGE)
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The problem with tracking fly evolution is that every so often, a species of fly will branch into two different species, and then those two will split again, and again and so forth, said Gregory Courtney, professor of entomology. If a series of these branches occurs over a brief period of time, the result will be a rapid radiation of new flies and an evolutionary tree that may look more like a bush.
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ISU photo by Bob Elbert
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