Vestigeal pelvic girdle and bones of hind limbs are the characteristic of

Options

A. Whale
B. Dolphin
C. Shark
D. Seal.

Answer

**Step-by-Step Solution:**

1. **Understanding Vestigial Structures**: Vestigial structures are remnants of organs or body parts that had a function in an early ancestor but have lost most or all of their original function in a modern organism. In this case, we are looking at the pelvic girdle and hind limb bones.

2. **Identifying the Organisms**: The question provides four options: whale, dolphin, shark, and seal. We need to determine which of these organisms has vestigial pelvic girdle and hind limb bones.

3. **Analyzing Each Option**:
- **Whale**: Whales are aquatic mammals that have evolved from land-dwelling ancestors. They possess a vestigial pelvic girdle and hind limb bones, which are remnants of their terrestrial ancestors.
- **Dolphin**: Dolphins are also classified as whales (specifically, they are toothed whales). They share similar characteristics with whales, including vestigial pelvic structures.
- **Shark**: Sharks are cartilaginous fish and do not have a pelvic girdle or hind limb bones as they are not mammals. Therefore, this option is incorrect.
- **Seal**: Seals are carnivorous mammals but do not exhibit vestigial pelvic girdle and hind limb bones in the same way that whales do. Thus, this option is also incorrect.

4. **Conclusion**: Based on the analysis, both whales and dolphins have vestigial pelvic girdle and hind limb bones. However, since the question specifically asks for the characteristic of a single organism, the best answer is "whale" because it is the most representative of the group with pronounced vestigial structures.

**Final Answer**: The vestigial pelvic girdle and bones of hind limbs are characteristics of **whales**.

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