Which two physiological processes provide the FAD and ATP required for fixation of atmospheric nitrogen?

Explanation

To answer the question about which two physiological processes provide FAD and ATP required for the fixation of atmospheric nitrogen, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nitrogen Fixation**:
- Nitrogen fixation is the process by which atmospheric nitrogen (N₂) is converted into a form that can be utilized by plants, such as ammonia (NH₃). This process is crucial for plant growth as nitrogen is an essential nutrient.

2. **Identifying the Energy Requirements**:
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