Which of the following is true w.r.t homologous structures?

Options

A. They show similarity in anatomy
B. They have similar function
C. They are the result of convergent evolution
D. They are the result of parallel evolution

Answer

To determine which statement is true with respect to homologous structures, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Homologous Structures**:
- Homologous structures are anatomical features in different species that share a common ancestry. They may have different functions but exhibit similar structural features.

2. **Analyzing the Options**:
- **Option A: They show similarity in anatomy**:
- This statement is true. Homologous structures have similar anatomical features due to their common evolutionary origin.
- **Option B: They have similar function**:
- This statement is false. Homologous structures may perform different functions despite having similar anatomy.
- **Option C: They are the result of convergent evolution**:
- This statement is false. Convergent evolution refers to the process where unrelated species develop similar traits, not homologous structures.
- **Option D: They are the result of parallel evolution**:
- This statement is also false. Parallel evolution occurs when related species evolve similar traits independently, which does not apply to homologous structures.

3. **Conclusion**:
- The only true statement regarding homologous structures is **Option A: They show similarity in anatomy**.

### Final Answer:
**The correct answer is Option A: They show similarity in anatomy.**