To produce bio gas in a bio gas plant, we need

Options :
  1. air but not water
  2. water but not air
  3. both water and air
  4. neither water nor air
Answer and Explanation :-

Answer: Option 2

Explanation:

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The tire left a skid mark on the road that looked like a mustache. So I shaved it off the pavement, stuffed it in my trunk, and took it home to wear to work the next day. Ah, but that's life, no?
-Jarod Kintz Ah but that's life no?