What are gas vacuoles ? State their functions.

Explanation

### Step-by-Step Solution:

1. **Definition of Gas Vacuoles**:
- Gas vacuoles, also known as pseudo vacuoles or air vacuoles, are specialized structures found primarily in prokaryotic cells.

2. **Structure of Gas Vacuoles**:
- Each gas vacuole is composed of submicroscopic hexagonal vesicles.
- These vesicles are surrounded by a thin protein membrane.
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