Existence of marsupials in Australia and New Zealand proves

Options

A. Continential drift
B. Geological period
C. New evolution
D. Both A and B

Answer

### Step-by-Step Solution:

1. **Understanding Marsupials**:
- Marsupials are a group of mammals that are characterized by giving birth to relatively undeveloped young, which then typically continue to develop in a pouch.
- Examples include kangaroos and koalas, which are predominantly found in Australia and New Zealand.

2. **Historical Context**:
- According to Charles Darwin, marsupials were considered less evolved compared to placental mammals.
- They thrived in environments where there was little to no competition from placental mammals.

3. **Geological Evidence**:
- The existence of marsupials in Australia and New Zealand provides evidence about the geological history of these continents.
- It suggests that these landmasses were once connected, allowing for the migration of marsupials before they became isolated.

4. **Continental Drift Theory**:
- The theory of continental drift posits that continents were once joined together and have since drifted apart.
- It is believed that around 30 to 40 million years ago, South America and Australia were connected in the southern hemisphere.

5. **Migration of Marsupials**:
- Marsupials likely migrated from South America to Australia when the continents were connected.
- As the continents drifted apart, marsupials became isolated in Australia and New Zealand, leading to their unique evolution in these regions.

6. **Conclusion**:
- The existence of marsupials in Australia and New Zealand supports both the continental drift theory and provides insights into the geological periods of these regions.
- Therefore, the correct answer to the question is that the existence of marsupials in these areas proves both continental drift and geological periods.

### Final Answer:
The existence of marsupials in Australia and New Zealand proves both continental drift and geological periods (Option D: Both A and B).

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