http://courses.washington.edu/bot113/summer/WebReadings/PdfReadings/CLAS...
http://en.wikipedia.org/wiki/Biodiversity
http://everythingscience.co.za/lifesciences/grade-10/09-biodiversity-and...
http://www.edu.pe.ca/threeoaks/teacherpages/higginbotham/Biology%20521%2...
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