State two economically important uses of heterotrophic bacteria

Explanation

### Step-by-Step Solution:

1. **Understanding Heterotrophic Bacteria**:
- Heterotrophic bacteria are microorganisms that cannot synthesize their own food and instead obtain energy by consuming organic matter from their environment.

2. **Identifying Economic Uses**:
- Heterotrophic bacteria have several economically important applications. Two notable examples include:

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