Explain the cause of industrial melanism in the butterflies of the birch moth from the perspective of evolutionary

Explain the cause of industrial melanism in the butterflies of the birch moth from the perspective of evolutionary doctrine and determine the form of selection.

1) Industrial melanism is a phenomenon when, due to the development of industry and air pollution in England in the 19-20 centuries, there was an increase in the number of dark-colored butterflies compared to light-colored.
2) The reason for the change in the direction of natural selection in favor of dark-colored butterflies is the pollution of birch trunks with soot in industrial areas, which gives an advantage in masking dark-colored butterflies.
3) This is the emergence of a moving form of natural selection.

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