In Looking Glass Land, the Queen tells Alice, "It takes all the running you can do, to keep in the same place." In evolutionary terms, it's an arms race; a species must continually adapt to a dynamic environment or risk extinction.
http://www.pbs.org/wgbh/evolution/library/01/5/l_015_03 http://www.sci.sdsu.edu/classes/bio508/ParasiteHostPresenation/sld018.htm
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