Which of the following is common to Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria...

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Which of the following is common to Azospirillum, Azotobacter, Anabaena, Nostoc and Oscillatoria?
(A) Prokaryotes
(B) Nitrogen-fixers
(C) Both (a) and (b)
(D) Eukaryotes
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