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Geographical Isolation is the separation of a population caused by a physical barrier. The barrier can be something like a mountain, a body of water, or a natural disaster.
The fish start out in one river.
When the river hits an obstacle, whether that might be a continental drift or a large rock that doesn't quickly erode, the river splits in two or more streams.
This barrier splits the organisms in the river.
When the fish split into two or more bodies of water, they change genetically.
The fish have changed genetically. They are now two different species. The splitting of a species due to geographical barriers or disturbances is geographical isolation.
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