Which of the following cyanobacteria can fix atmospheric nitrogen?
$I.$ Anabaena
$II.$ Oscillatoria
$III.$ Nostoc
Choose the correct option.

  • A
    $I \, \& \, II$
  • B
    $II \, \& \, III$
  • C
    $I \, \& \, III$
  • D
    $I, II \, \& \, III$

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