![](http://www.alamy.com/thumbs/6/DCA72C8C-F6E6-4AF4-A140-5674FBED7635/2H0JJJ2.jpg)
Physiologists study plants. Oxapampa, Perú - August 2008.
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Photo credit: © Paco Chuquiure / Alamy / Afripics
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