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Millions of years ago fossil fuels originated from plants. A nitrogen atom from fossil fuel is now inside in a protein molecule in your body. What is the shortest path that the nitrogen atom could have taken starting with plants that lived millions of years ago, until the protein molecule in your body. Use those points:

  • consumers

  • producers

  • reducers

  • fossil fuels

  • $NO_x$

I guess the route could be producers -> reducers -> fossil fuels -> consumers -> $NO_x$

But this could be wrong, because NO does not have to be produced by consumers.

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closed as off-topic by Chris, Bez, Chris Stronks, The Last Word, WYSIWYG Dec 11 at 9:14

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producers-reducers-fossil fuels-NO-producers-consumers. –  biogirl Nov 6 '13 at 9:57
2  
fossil fuel is out of question.. it is a byproduct not a precursor for a metabolite.. atmospheric nitrogen can be fixed to nitrate by physicochemical or biochemical processes –  WYSIWYG Nov 7 '13 at 13:04
    
Fossil fuel -combustion-> NOx -deposition-> plant -> person –  Abe Nov 18 '13 at 6:04