Which gas present in air is essential for aerobic respiration? What is the role of oxygen during respiration?

Explanation

### Step-by-Step Solution:

1. **Identify the Essential Gas**:
The gas that is essential for aerobic respiration is **oxygen**.

2. **Define Aerobic Respiration**:
Aerobic respiration is a type of respiration that requires oxygen to occur. It is the process through which organisms convert glucose and oxygen into energy, carbon dioxide, and water.

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