What is the benefit of not having cartilage between the trachea and oesophagus?

Explanation

### Step-by-Step Solution:

1. **Understanding the Structures**: The trachea is the airway that conducts air to the lungs, while the esophagus is the tube that carries food to the stomach. These two structures are located close to each other in the neck and thoracic cavity.

2. **Role of Cartilage in the Trachea**: The trachea is supported by C-shaped rings of cartilage that keep it open and prevent it from collapsing during breathing. This structure is crucial for maintaining a clear airway for air passage.

3. **Absence of Cartilage Between Trachea and Esophagus**: Unlike the trachea, the area between the trachea and the esophagus does not have cartilage. This absence allows the esophagus to expand when food is swallowed.

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