Coelacanth is considered a connecting link between

Options

A. Amphibians and reptiles
B. Fish and amphibians
C. Chordate and non- chordate
D. Birds and mammals

Answer

To solve the question "Coelacanth is considered a connecting link between," we need to analyze the characteristics of the coelacanth and its relation to other groups of animals.

### Step-by-Step Solution:

1. **Identify what Coelacanth is**: Coelacanth is a large bony fish that was believed to be extinct until live specimens were discovered in the 20th century.

2. **Understand the significance of Coelacanth**: It is often referred to as a "living fossil" because it has characteristics that are primitive and similar to both fish and amphibians.

3. **Examine the characteristics of Coelacanth**:
- **Aquatic Habitat**: Coelacanth lives in water, which is a common trait shared with fish and amphibians. Amphibians can also live in water during their larval stage.
- **Fins**: Coelacanth has lobed fins, which are more advanced than the typical fins found in most fish. These lobed fins are considered a precursor to the limbs of amphibians.
- **Lungs**: Some primitive forms of coelacanths had lungs, which is a characteristic that links them to amphibians, as amphibians also have lungs for breathing air.

4. **Compare with the options**:
- **Amphibians and Reptiles**: Not a direct link.
- **Fish and Amphibians**: This option fits well because coelacanth has traits of both groups.
- **Caudate and Non-Caudates**: This is not directly relevant.
- **Birds and Mammals**: Not applicable.

5. **Conclusion**: Based on the characteristics and the analysis, Coelacanth is considered a connecting link between fish and amphibians.

### Final Answer:
Coelacanth is considered a connecting link between **fish and amphibians**.

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