Name the animal group having tracheae, book gill and book lungs as their respiratory organs.

Explanation

To answer the question about the animal group that has tracheae, book gills, and book lungs as their respiratory organs, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Respiratory Organs**:
- First, we need to clarify what respiratory organs are. They are specialized structures that facilitate the exchange of gases (oxygen and carbon dioxide) between the organism and its environment.

2. **Identifying Tracheae**:
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