References
1. "Symbiosis," Wikipedia, last modified June 8,
2013, http://en.wikipedia.org/wiki/Symbiosis.
2. Jef Akst, "Ants Save Trees From Elephants," TheScientist,
last modified September2, 2010, http://www.the-scientist.com/?articles.view/articleNo/29239/title/Ants-save-trees-from-elephants/.
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