In Whale and Dolphin the tail bears

Options

A. Dorsal fin
B. Caudal fin
C. Two vertical fluke
D. Two horizontal flukes .

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the structure present in the tail of whales and dolphins.

2. **Identifying the Options**: The options provided are:
- Dorsal fin
- Caudal fin
- Two vertical flukes
- Two horizontal flukes

3. **Analyzing the Anatomy of Whales and Dolphins**:
- Whales and dolphins are marine mammals that have adapted to life in water.
- Their tails are specialized for swimming.

4. **Understanding Tail Structure**:
- The tail of whales and dolphins is primarily made up of two large, horizontal flukes.
- These flukes are used for propulsion and steering in the water.

5. **Evolutionary Background**:
- Whales and dolphins evolved from terrestrial (land) mammals that had four limbs.
- The horizontal flukes evolved from these limbs, allowing for efficient movement in aquatic environments.

6. **Eliminating Incorrect Options**:
- Dorsal fin and caudal fin are present in these animals but are not part of the tail structure.
- Vertical flukes are not found in whales and dolphins; they have horizontal flukes instead.

7. **Conclusion**: The correct answer to the question is that the tail of whales and dolphins bears "two horizontal flukes."

**Final Answer**: Two horizontal flukes.

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