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| Nitrogen is cycled throughout the biosphere and abiotic elements. nitrogen in the atmosphere. 2004. Photograph. The National Christmas Tree AssociationWeb. 6 Sep 2012. <http://www.realtrees4kids.org/images/6-8images/nitrogencycle2.gif>. |
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| Photosynthetic organisms such as plants produce Oxygen by using CO2 and water. Photosynthesis plays a key role in the Oxygen and Carbon Cycles of the planet. Swamp biome behind my grandparents house. 42.2694° N, 71.6167° W |
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