Give an example of chemosynthetic bacterium.

Explanation

### Step-by-Step Solution

1. **Understanding Chemosynthesis**:
- Chemosynthesis is a biological process where certain organisms convert inorganic molecules into organic matter. This process typically involves the conversion of carbon dioxide and other nutrients into organic compounds using energy derived from chemical reactions involving inorganic substances.

2. **Energy Source**:
- In chemosynthesis, energy is obtained from the chemical reactions of inorganic molecules. Common inorganic molecules involved include hydrogen gas, hydrogen sulfide, and other similar substances.

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