Answer:
Natural selection
Step-by-step explanation:
When the environment became polluted with soot from the industrial revolution, the light-colored moths became conspicuous to their predators in the environment – as opposed to black colored moths that camouflaged. Therefore the population of light-colored moths had low chances of passing their genes to the next generation because they were predated on more than black moths. Over time the black moths dominated the moth's population and the light colored moths became eliminated.