Adaptive radiation is

Options

A. Evolution of different species from a common ancestor
B. Adaptation due to geographical isolation
C. Migration of members of a species to different geographical areas
D. Power of adaptation of an individual to a variety of environments

Answer

**Step-by-Step Solution:**

1. **Understanding Adaptive Radiation**:
- Adaptive radiation refers to the process where organisms diversify rapidly from an ancestral species into a wide variety of forms to adapt to different environments.

2. **Identifying Key Characteristics**:
- It involves the evolution of different species from a common ancestor.
- It is influenced by various factors such as climatic conditions, habitats, and feeding habits.

3. **Examples of Adaptive Radiation**:
- A classic example is Darwin's finches, which evolved from a common ancestor into multiple species with different beak shapes and sizes adapted to their specific feeding habits on the Galapagos Islands.

4. **Evaluating the Options**:
- **Option A**: Evolution of different species from a common ancestor - This accurately describes adaptive radiation.
- **Option B**: Adaptation due to geographical isolation - While geographical isolation can lead to speciation, it does not encompass the full concept of adaptive radiation.
- **Option C**: Migration of members of a species to different geographical areas - This does not define adaptive radiation.
- **Option D**: Power of adaptation of an individual to a variety of environments - This refers to individual adaptation, not the speciation process.

5. **Conclusion**:
- After evaluating all options, the correct answer is **Option A**: Evolution of different species from a common ancestor.