Koala and Bandicoot show

Options

A. Adaptive radiation
B. Convergent evolution
C. Parallel evolution
D. Both (2) and (3)

Answer

### Step-by-Step Solution:

1. **Understanding the Organisms**:
- Koalas and Bandicoots are both marsupials that are native to Australia. They have different lifestyles and feeding habits.

2. **Identifying the Evolutionary Concept**:
- The question asks what Koalas and Bandicoots demonstrate in terms of evolutionary biology. The key concept here is to understand how species evolve from a common ancestor.

3. **Defining Adaptive Radiation**:
- Adaptive radiation is a process where organisms diversify rapidly into a variety of forms to adapt to different environments. This usually occurs when a species colonizes a new habitat with various ecological niches.

4. **Analyzing the Ancestors**:
- Both Koalas and Bandicoots evolved from a common ancestor, which were the Australian marsupials. Over time, they adapted to their specific environments and developed different characteristics.

5. **Comparing Feeding Habits**:
- Koalas primarily feed on eucalyptus leaves and are arboreal (tree-dwelling), while Bandicoots are insectivores and have a ground-dwelling lifestyle. This difference in diet and habitat illustrates how they adapted to their respective environments.

6. **Conclusion**:
- Since Koalas and Bandicoots evolved from a common ancestor and adapted to different ecological niches, they are an example of adaptive radiation.

### Final Answer:
Koala and Bandicoot show **adaptive radiation**.

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