Final answer:
Evolution is the change in genetic makeup in populations over time, driven by natural selection and genetic variation.
Explanation:
Evolution can be defined as the change in the genetic makeup of a population over time, happening from one generation to the next. It relies on genetic variation and natural selection to pass on beneficial traits for species survival. Macroevolution involves broader scale evolutionary changes seen over geological time, while microevolution refers to changes in a population's genetic structure.
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