Why do people living at higher altitudes have higher lung capacity and more red blood corpuscles?

Explanation

### Step-by-Step Solution:

1. **Understanding High Altitude Conditions**:
- People living at higher altitudes are exposed to lower atmospheric pressure. This results in a lower partial pressure of oxygen in the air.

2. **Effects of Low Oxygen Availability**:
- The reduced availability of oxygen means that less oxygen is available for diffusion into the bloodstream. This can lead to a condition known as hypoxia, where the body does not receive enough oxygen.

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