What are flocs? Explain their role.

Explanation

### Step-by-Step Solution:

1. **Definition of Flocs**:
- Flocs are aggregates or clusters of microorganisms, primarily bacteria, that are associated with fungal elements or filaments. They form a mesh-like structure that plays a crucial role in the treatment of wastewater.

2. **Composition of Flocs**:
- Flocs consist of a combination of bacteria and fungi. The bacteria are responsible for breaking down organic matter, while the fungal filaments help in forming the structural framework of the floc.

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