List the steps involved in the formation of new species.

Explanation

### Step-by-Step Solution for the Formation of New Species

1. **Initial Population**: Start with a single population of organisms that share a common gene pool.

2. **Geographical Isolation**: A geographical barrier (such as mountains, rivers, or distance) separates the initial population into two distinct sub-populations. This barrier prevents any gene flow between the two groups.

3. **Genetic Isolation**: Due to the geographical barrier, the two sub-populations become genetically isolated. They can no longer interbreed or exchange genetic material.

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