Which one is not a vestigial organ?

Options

A. Flipper of Seal
B. Coccyx of man
C. Pelvic of python
D. Wing of kiwi.

Answer

To determine which of the given options is not a vestigial organ, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Vestigial Organs**:
- Vestigial organs are structures that have lost most or all of their ancestral function through evolution. They are remnants of features that were functional in the organism's ancestors.

2. **Identify Examples of Vestigial Organs**:
- Common examples of vestigial organs include:
- **Wings of Kiwi**: These are non-functional wings that are not used for flying.
- **Coccyx in Humans**: This is the tailbone, a remnant of a tail that is no longer functional.
- **Pelvic Girdle of Python**: This is a remnant of hind limbs that are no longer used for locomotion.
- **Splint Bones of Horses**: These are remnants of extra toes that are not functional.

3. **Analyze the Given Options**:
- **Flipper of Seal**: This is a functional structure used for swimming.
- **Coccyx of Man**: This is a vestigial organ.
- **Pelvic Girdle of Python**: This is a vestigial organ.
- **Wings of Kiwi**: This is a vestigial organ.

4. **Determine the Correct Answer**:
- Among the options, the only structure that is functional and not vestigial is the **Flipper of Seal**. It is actively used for swimming, unlike the other options which are vestigial.

5. **Conclusion**:
- Therefore, the answer to the question "Which one is not a vestigial organ?" is the **Flipper of Seal**.

### Final Answer:
- **Flipper of Seal** is not a vestigial organ.

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