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Evolution on Double Time

On a geological time scale, it did not take very long for life to evolve from the very first organisms, with a scant few genes, to relatively complex microbes with several thousand genes that were capable of altering the chemistry of the atmosphere and oceans. Gene duplication may explain the speed of this transformation. (www.harpercollins.com/hc/features/evolution)

Credits: Excerpted from Evolution: The Triumph of an Idea, by Carl Zimmer. 2001 WGBH Educational Foundation and Clear Blue Sky Productions. Reprinted with permission of HarperCollins.

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Deep Time/History of Life

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