Which one is a vestigial organ in humans ?

Options

A. Pinna
B. Pinna muscles
C. Ileum
D. Teeth

Answer

**Step-by-Step Solution:**

1. **Understanding Vestigial Organs**:
- Vestigial organs are those that have lost most or all of their original function through the course of evolution. They are present in a rudimentary form and are often remnants of organs that were functional in ancestral species.

2. **Identifying the Options**:
- The options provided are:
- Pinna
- Pinna muscles
- Ileum
- Teeth

3. **Analyzing Each Option**:
- **Pinna**: This is the outer part of the ear, which plays an important role in hearing by collecting sound waves. Therefore, it is not a vestigial organ.
- **Pinna Muscles**: These muscles were once used for moving the ears, similar to how some animals can move their ears to better capture sounds. In humans, these muscles are no longer functional, making them vestigial.
- **Ileum**: This is a part of the small intestine that is involved in digestion and absorption of nutrients. It is still functional, so it is not a vestigial organ.
- **Teeth**: Teeth are essential for biting and chewing food. They are fully functional and therefore are not vestigial.

4. **Conclusion**:
- Among the options, the **pinna muscles** are the only ones that can be classified as vestigial organs in humans since they no longer serve a useful purpose.

**Final Answer**: Pinna muscles

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