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The evolutionary story of moths in Engla...

The evolutionary story of moths in England during industrialisation reveals, that ' evolution is apparently reversible '. Clarify this statement.

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With the industrial growth in 1920, the white-winged grey-coloured Biston betularia was rapidly replaced by a dark-coloured melanic Biston carbonaria as the latter had more chances of survival and favoured by Natural selection. But after 1956, the coal was rapidly replaced by oil and electricity as energy source in the industries which reduced soot deposition. So the light coloured moth is again replacing the dark-coloured moth by reverse evolution.
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