What is geographical isolation?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Geographical Isolation**:
Geographical isolation refers to a process where populations of the same species become separated by physical barriers, preventing them from mating and interbreeding. This leads to the development of distinct species over time.

2. **Role of Barriers**:
The barriers that cause geographical isolation can be natural features such as mountains, rivers, or oceans. These barriers prevent individuals of the same species from coming into contact with each other, leading to a lack of gene flow between the separated populations.

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