The following reactions take place during anaerobic digestion of organics:

1. methane production

2. alkaline fermentation

3. acid fermentation

4. acid regression

The correct sequence of these reactions is

- 1
  
  3, 4, 2, 1
- 2
  
  4, 3, 2, 1
- 3
  
  3, 4, 1, 2
- 4
  
  4, 3, 1, 2

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