It was found that when the same environmental challenges was provided to the two sets of organisms who belonged to different ancestors and with different evolution patterns evolved similar phenotypic trait to survive better is called :

Options

A. Natural selection
B. Adaptive radiation
C. Convergent evolution
D. Genetic drift

Answer

To solve the question, we need to identify the phenomenon where different organisms, despite having different ancestors and evolutionary paths, develop similar traits in response to the same environmental challenges. This concept is well-known in evolutionary biology.

### Step-by-Step Solution:

1. **Understanding the Question**: The question describes a scenario where two sets of organisms, which are not closely related and have different evolutionary backgrounds, evolve similar traits due to facing the same environmental challenges.

2. **Identifying the Key Terms**: The key terms in the question are "different ancestors," "different evolution patterns," "similar phenotypic traits," and "environmental challenges."

3. **Exploring Evolutionary Concepts**: In evolutionary biology, there are two main types of evolution that can explain the development of similar traits:
- **Divergent Evolution**: This occurs when two or more related species become more dissimilar over time, often due to different environments.
- **Convergent Evolution**: This occurs when unrelated organisms develop similar traits or adaptations in response to similar environmental challenges.

4. **Applying the Concepts**: Since the organisms in the question have different ancestors and evolutionary paths, divergent evolution does not apply. Instead, we focus on convergent evolution, where unrelated species evolve similar traits due to similar environmental pressures.

5. **Conclusion**: The correct term for the phenomenon described in the question is **convergent evolution**. This is characterized by different organisms evolving similar adaptations to survive in comparable environments, despite not sharing a recent common ancestor.

### Final Answer:
The phenomenon described in the question is called **convergent evolution**.

---