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Respiratory structures in hemichordates ...

Respiratory structures in hemichordates are

A

Trachea

B

Gills

C

Lungs

D

Ctenidia

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Hemichordates**: Hemichordates are a unique group of animals that exhibit characteristics of both chordates and non-chordates. They are not fully classified as either group, which makes them interesting for study. 2. **Identifying Key Features**: Hemichordates possess a notochord, which is a characteristic feature of chordates. However, they lack a true nerve chord, which is typical of non-chordates. This combination of features is essential for understanding their classification. 3. **Respiratory Structures**: The primary respiratory structures in hemichordates are gills. These gills are used for respiration, allowing hemichordates to extract oxygen from water. 4. **Example of Hemichordates**: A well-known example of hemichordates is Balanoglossus, which is found in marine environments. This example helps illustrate the characteristics and respiratory structures of the group. 5. **Conclusion**: Therefore, the respiratory structures in hemichordates are gills, making the correct answer to the question about their respiratory structures clear.
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