One of the important consequences of geographical isolation is

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding Geographical Isolation**:
- Geographical isolation refers to the separation of populations due to physical barriers such as mountains, rivers, or distances. This separation can lead to different evolutionary paths for the isolated populations.

2. **Defining Speciation**:
- Speciation is the process by which new species arise. It occurs when populations of a species become so different that they can no longer interbreed, leading to the formation of distinct species.

3. **Consequences of Geographical Isolation**:
- One of the primary consequences of geographical isolation is that it can lead to speciation. When populations are separated, they may evolve independently, adapting to their unique environments.

4. **Reproductive Isolation**:
- Reproductive isolation is a key mechanism in speciation. It occurs when different populations develop differences in mating behaviors, timing, or other reproductive traits that prevent them from interbreeding even if they come into contact again.

5. **Conclusion**:
- Therefore, one of the important consequences of geographical isolation is the promotion of speciation through reproductive isolation. This means that as populations adapt to their isolated environments, they may develop unique reproductive traits that further solidify their status as separate species.