Give appropriate biological / technical terms for the following:
Lack of oxygen at higher altitude.

Explanation

### Step-by-Step Solution

1. **Understanding the Context**: The question asks for a biological or technical term that describes the lack of oxygen at higher altitudes. This situation arises when individuals ascend to areas where the atmospheric pressure is lower, leading to a decrease in the availability of oxygen.

2. **Identifying the Condition**: When a person experiences a lack of oxygen due to high altitude, it is referred to as a specific medical condition. This condition is characterized by insufficient oxygen supply to the body tissues.

3. **Term for Lack of Oxygen**: The appropriate biological term for the lack of oxygen in the body is **"Hypoxia."** Hypoxia occurs when the body does not receive enough oxygen, which can happen at higher altitudes.

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