http://www.ucmp.berkeley.edu/exhibits/biomes/deserts.php
http://www.blueplanetbiomes.org/desert.htm
http://environment.nationalgeographic.com/environment/habitats/desert-threats/
http://desertfactbook.weebly.com/competition.html
http://desertbiomepro.weebly.com/symbioticcompetitive-relationships.html
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