State two advantages of `H_(2)-O_(2)` fuel cell over ordinary cell.

Explanation

To answer the question regarding the advantages of H2-O2 fuel cells over ordinary cells, we can break down the solution into clear steps.

### Step-by-Step Solution:

1. **Understanding Fuel Cells**:
- Fuel cells, such as the H2-O2 fuel cell, convert chemical energy directly into electrical energy through electrochemical reactions.

2. **Advantage 1: Environmental Impact**:
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