Composting toilet systems require

Options :
  1. aerobic bacteria
  2. anaerobic bacteria
  3. large fungal colonies
  4. large volumes of water
Answer and Explanation :-

Answer: Option 1

Explanation:

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In his face there came to be a brooding peace that is seen most often in the faces of the very sorrowful or the very wise. But still he wandered through the streets of the town, always silent and alone.
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