What are requirements of nitrogen fixation ?

Explanation

### Step-by-Step Solution

1. **Understanding Nitrogen Fixation**:
- Nitrogen fixation is the biochemical process that converts atmospheric nitrogen (N₂), which is inert and not usable by most organisms, into ammonia (NH₃), a form that can be utilized by plants.

2. **Identifying the Requirements**:
- Nitrogen fixation requires three key components:
1. **Reducing Agent**: A strong reducing agent is necessary to facilitate the conversion of nitrogen gas into ammonia.
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