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By cyanobacteria
By electrical discharges in the atmosphere
By industrially synthesised fertilizer
By denitrification
Nitrogen is present in
Nitrogenous Food is
Norepinephrine increases
Normal adult human male has
Normal fasting blood sugar level per 100 ml. of blood in man is
Nuclear membrane is absent in
Nuclide used to detect brain tumors and thyroid defects is
Number of chamber found in human heart is
Number of chromosomes in downs syndrome is
Number of chromosomes in E.coli