Define tracheal intercom. Why is the respiratory system of cockroach more efficient than that of earthworm?

Explanation

### Step-by-Step Solution:

1. **Define Tracheal Intercom**:
The tracheal intercom is a complex network of air tubes formed by the division and re-division of the trachea within the body of certain arthropods, including cockroaches. This system facilitates the efficient exchange of gases, primarily oxygen and carbon dioxide, throughout the organism.

2. **Structure of the Tracheal System**:
The tracheal system begins at openings called spiracles, which lead into larger tubes known as trachea. These trachea further branch into smaller tubes called tracheoles. This branching structure allows for a large surface area for gas exchange.

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