Which derives energy through photosynthesis for nitrogen fixation

Options :
  1. Azotobacter
  2. Anabaena
  3. Bacillus
  4. all the above
Answer and Explanation :-

Answer: Option 1

Explanation:

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Life, too, is like that. You live it forward, but understand it backward. It is only when you stop and look to the rear that you see the corpse caught under your wheel.
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