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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