What are the biogeochemical cycles?  Which gas makes up 78% of atmosphere and is also a part of many molecules essential to life?  Draw a flow chart to illustrate the cycle of this gas in nature.

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bio chemical cycles are a constant interaction btwn the biotic and abiotic components of the biosphere makes it a dynamic , but a stable system. 
nitrogen gas makes up 78% of atmosphere  
diagram : text book pg no : 198 ( figure 14.6 )
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