Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas $(N_2)$ to the atmosphere?

  • A
    Aerobic nitrate oxidation and nitrite reduction
  • B
    Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
  • C
    Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
  • D
    Anaerobic ammonium oxidation and denitrification.

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