Lung fishes

Options

A. Seldom swim
B. Swim like eels
C. Creep over paired fins
D. Both B and C

Answer

### Step-by-Step Solution:

1. **Understanding Lung Fishes**:
- Lung fishes are a unique group of fish that possess both gills and lungs. This allows them to breathe air when necessary, especially in environments where water levels are low.

2. **Characteristics of Lung Fishes**:
- They have an elongated body, which is similar to that of eels. This body shape aids in their movement through water.

3. **Breathing Mechanism**:
- Lung fishes are classified as facultative air breathers. This means they primarily breathe through their gills but can switch to lung breathing when the water is low in oxygen.

4. **Movement**:
- Lung fishes have paired fins, specifically pelvic and pectoral fins. These fins enable them to swim and also to creep along the substrate.

5. **Analyzing the Options**:
- The options provided are:
- A) Seldom swim
- B) Swim like eels
- C) Creep over
- D) Both B and C
- Given their characteristics, lung fishes do indeed swim like eels due to their elongated bodies and can also creep using their paired fins.

6. **Conclusion**:
- The correct answer is option D, which states that lung fishes can both swim like eels and creep over using their paired fins.

### Final Answer:
**The correct answer is D) Both B and C.**

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