Why mercury is used in anaerobic respiration experiments ?

Explanation

### Step-by-Step Solution:

1. **Understanding Anaerobic Respiration**:
- Anaerobic respiration occurs in the absence of oxygen. It is a type of respiration that some organisms use to generate energy when oxygen is not available.

2. **Role of Mercury in Experiments**:
- Mercury is used in experiments involving anaerobic respiration primarily because it is a liquid at room temperature. This property allows it to form a barrier that prevents oxygen from entering the experimental setup.

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