Ecology
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Abiotic and Biotic Factors
Land and Aquatic Biomes
Biosphere
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citations
http://www.eoearth.org/article/AP_Environmental_Science_Chapter_5-_The_Biosphere
http://aquafind.com/articles/Biological-Productivity-Of-Water-Bodies.php
http://andreamabio.blogspot.com/2008/10/main-land-biomes.html