Which is necessary for biological nitrogen fixation

Options :
  1. F
  2. Cl
  3. Mo
  4. W


Answer and Explanation :-

Answer: Option 3

Explanation:

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The idea of my future simultaneously thrilled and terrified me, like standing at the lip of a very sheer cliff- I could fly, or fall. I didn't know how to fly, and I didn't want to fall. So I backed away from the cliff and went in search of something that had a clear, solid trajectory for me to follow, like hopscotch.
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