Grey rats and tan rats
The genetic variation between the rat population is the ones with tan fur and grey fur. The variation is in favor of the tan fur rat.
Many grey fur rats made; however, not many made it. The rats with grey fur struggle to survive because they can lend in with the land like the tan fur rats.
The rats with the tan color fur have a higher fitness which means that they will survive and reproduce.
The better trait is the tan color fur so the gene pool changed and it took over which means their is no more grey color fur rats.
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