http://en.wikipedia.org/wiki/Natural_selection
http://evolution.berkeley.edu/evolibrary/article/evo_25
http://darwin200.christs.cam.ac.uk/pages/index.php?page_id=d3
http://www.globalchange.umich.edu/globalchange1/current/lectures/selecti...
http://anthro.palomar.edu/evolve/evolve_2.htm
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