Without the concept of geographic distribution, one might assume all the members of a species live close to each other. Because some members of a species are scattered around the world, they adapt to the environment they are living in. The similarities in structure imply that the organisms are from a common species and supports evolution.
An example would be dogs. Siberian huskies have long, thick fur to keep warm in the arctic. Chihauhau's have short hair to keep cool in Mexico.
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