nitrate cycle

do not understand trying to revise

Answers
you could try this, it's a bit of fun. If the problem is trying to make it 'stick' in your head, try drawing it out and sticking it to your wall:
parkfields
27 April 2011
http://www.sites.ext.vt.edu/virtualfarm/flash_mov/nitrogencycleintro.swf
parkfields
27 April 2011
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