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Geographical isolation is refers to a group of plants, animals or other living creatures being separated from mixing genes within their same species.
An example of geographic isolation is the people of a remote village only able to reproduce within the village population.
Typically geographic isolation is the result of an accident or coincidence. 
If we talk about the cause of geographical isolation,  they are as follows-
1. Isolation by barriers.
2. Isolation by distance
3.Isolation after an event
4. Isolation by seperation
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