Distinguish between the roles of flocks and anaerobic sludge digesters in sewage treatments.

Explanation

To distinguish between the roles of flocks and anaerobic sludge digesters in sewage treatment, we can outline their functions as follows:

### Step-by-Step Solution:

1. **Definition of Flocks**:
- Flocks are aggregates of microorganisms, primarily aerobic bacteria, that play a crucial role in the treatment of sewage.

2. **Role of Flocks**:
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