Different geographical barriers physically separated the tortoises on the galápagos islands. this separation resulted in the evolution of subspecies. this is an example of speciation.

Allopatric

Explanation:

Allopatric or geographic speciation is the speciation that occurs when a population of the same species becomes isolated by a sudden geographical change (for example, after an earthquake, the formation of mountains or rivers). Therefore both populations will evolve differently until they reach a point where they can no longer breed between them.

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