Air bladder is present in:

Options

A. Chondricthyes
B. Star fishes
C. Actinopterygii
D. Flying fishes

Answer

To determine which of the given options has an air bladder, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Air Bladder**:
- An air bladder, also known as a swim bladder, is an internal gas-filled organ that helps fish maintain buoyancy and stability in the water.

2. **Identify the Groups of Fish**:
- The options provided are:
- A) Conjunctives
- B) Starfishes
- C) Actinopterygii
- D) Flying Fishes

3. **Analyze Each Option**:
- **Conjunctives**: This term does not refer to a specific group of fish. It might be a misinterpretation or typo. However, it is not relevant to the question.
- **Starfishes**: Starfishes (or sea stars) are echinoderms and do not possess an air bladder.
- **Actinopterygii**: This is a class of fish known as ray-finned fishes, which typically have air bladders.
- **Flying Fishes**: Specifically known as Exocetus, these fishes belong to the class Actinopterygii and possess air bladders.

4. **Determine the Correct Answer**:
- Since both Actinopterygii and Flying Fishes are associated with air bladders, the most specific and correct answer based on the options provided is **D) Flying Fishes**.

5. **Conclusion**:
- The air bladder is present in flying fishes, which are a part of the class Actinopterygii.

### Final Answer:
**The air bladder is present in Flying Fishes (Option D).**

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