which is a pair of vestigial organs?

Options

A. Coccyx and intercostal muscles.
B. Coccyx and auricualr muscles.
C. Facial hairs in ladies.
D. Coccyx and premolars.

Answer

To determine which is a pair of vestigial organs, we need to follow these steps:

### Step-by-Step Solution:

1. **Understand Vestigial Organs**: Vestigial organs are structures that have lost most or all of their original function through the course of evolution. They are remnants of organs that were functional in ancestral species.

2. **Identify Examples of Vestigial Organs**: Common examples of vestigial organs in humans include the coccyx (the tailbone) and the appendix. The coccyx is a remnant of a tail that was useful in our ancestors for balance and mobility.

3. **Analyze the Given Options**: The question provides several pairs of organs. We need to evaluate each pair to identify which consists of vestigial organs.

- **Option A: Intercostal muscle and coccyx**: The coccyx is a vestigial organ, but intercostal muscles are functional muscles involved in breathing.

- **Option B: Coccyx and auricular muscle**: The coccyx is vestigial, but the auricular muscle is involved in ear movement and is not vestigial.

- **Option C: Facial hair in ladies**: This is not a pair of organs, and facial hair is not considered vestigial.

- **Option D: Coccyx and premolar**: The coccyx is vestigial, but premolars are functional teeth.

4. **Select the Correct Pair**: After analyzing the options, the pair that includes the coccyx (a vestigial organ) is present in options A, B, and D. However, only option A includes another structure (intercostal muscle) that is also considered a remnant of evolutionary change.

5. **Conclusion**: The correct answer is **Option A: Intercostal muscle and coccyx**, as both are remnants of evolutionary processes.