House sparrows have adapted to the climate of North America, mosquitoes have evolved in response to global warming, and insects have evolved resistance to our pesticides. These are all examples of microevolution—evolution on a small scale.

Here, you can explore the topic of microevolution through several case studies in which we’ve directly observed its action.

We can begin with an exact definition.

Microevolution is evolution on a small scale.

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Definition of Microevolution