Microevolution is evolution an a small scale within a single population. It cannot always be seen in a species, it sometimes only effects how a species survives.
The three ways the variations occur are through mutation, gene flow, and natural selection.
Mutation is where some genes randomly mutate into different genes.
Gene flow, or migration, is where different genes enter a population through reproduction.
And natural selection is the idea that the strongest survive and the weak genes die off.
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