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The peppered white moth Biston betularia is very common in England. This moth rests on branches of trees and is able to blend with the background. The darker melanic form appeared much later and is plentiful in industrial regions. The original white form is absent in polluted regions because

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The peppered white moth Biston betularia is very common in England. This moth rests on branches of trees and is able to blend with the background. The darker melanic form appeared much later and is plentiful in industrial regions. The original white form is absent in polluted regions because






 
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