One of the important consequences of geographical isolation is

Options

A. Preventing speciation
B. Speciation through reproductive isolation
C. Random creation of new species
D. No change in the isolated fauna

Answer

To solve the question regarding the important consequences of geographical isolation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Geographical Isolation**:
- Geographical isolation occurs when a population is separated by physical barriers such as mountains, rivers, or distance. This separation prevents individuals from interbreeding.

2. **Identifying Consequences of Geographical Isolation**:
- One of the main consequences of geographical isolation is the potential for speciation, which is the process by which new species arise.

3. **Evaluating the Options**:
- **Option 1: Preventing Speciation**: This option suggests that geographical isolation prevents speciation. However, geographical isolation actually promotes speciation by limiting gene flow between populations.
- **Option 2: Speciation through Reproductive Isolation**: This option indicates that geographical isolation leads to speciation through reproductive isolation. This is correct because when populations are isolated, they can evolve independently, leading to reproductive barriers.
- **Option 3: Random Creation of New Species**: This option implies that new species arise randomly. While mutations and genetic drift can contribute to speciation, geographical isolation is not random; it is a specific event that leads to speciation.
- **Option 4: No Change in the Isolated Fauna**: This option suggests that there is no change in the isolated populations. This is incorrect because geographical isolation typically leads to evolutionary changes over time.

4. **Conclusion**:
- After evaluating all the options, the correct answer is **Option 2: Speciation through reproductive isolation**. This option accurately reflects one of the significant consequences of geographical isolation.

### Final Answer:
**Speciation through reproductive isolation** is one of the important consequences of geographical isolation.

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