The major source of carbon fixation on earth is from the __________.

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     photoheterotrophs
      photoautotrophs
      chemoautotrophs
      chemoheterotrophs
asked May 16, 2012 in Microbiology by anonymous
    

1 Answer

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photoautotrophs
answered May 17, 2012 by Bioshare ~Top Expert~ (34,070 points)



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