Natural selection is the only process that consistently results in populations changing for the better.
How does evolution occur as a result of natural selection?
When individuals with particular traits outperform others in a group in terms of survival or reproduction rates and pass on these genetic traits to their progeny, this phenomenon is known as natural selection (Survival of the Fittest)
Populations of living things adapt and change through a process called natural selection. A gene's frequency varying within a population is referred to as microevolution.
Therefore, a gene's frequency in a population fluctuating is known as microevolution.
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