When more than one adaptive radiations appear in an isolated geographical area, that it is called.

Options

A. Natural selection
B. Convergent evolution
C. Divergent evlution
D. Retrogressive evolution

Answer

**Step-by-Step Solution:**

1. **Understanding Adaptive Radiation**:
- Adaptive radiation refers to the process where a single ancestral species diversifies into a variety of forms to adapt to different environments. This occurs due to environmental pressures that lead to the development of new species.

2. **Identifying the Context**:
- The question specifies a scenario where more than one adaptive radiation occurs in an isolated geographical area. This means that multiple species are evolving and adapting to similar environmental conditions in a confined space.

3. **Exploring Evolution Types**:
- The types of evolution mentioned include natural selection, convergent evolution, divergent evolution, and retrogressive evolution. We need to determine which one fits the description of multiple adaptive radiations in isolation.

4. **Defining Convergent Evolution**:
- Convergent evolution occurs when different species from different evolutionary backgrounds develop similar traits or adaptations in response to similar environmental challenges. This is distinct from adaptive radiation, which focuses on diversification from a common ancestor.

5. **Conclusion**:
- Given the context of multiple adaptive radiations occurring in an isolated area, the correct term that describes this phenomenon is **convergent evolution**. This is because different species adapt similarly to the same environmental pressures despite having different ancestral origins.

**Final Answer**: The phenomenon is called **convergent evolution**.

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