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

Explanation

During the last century in the industrial regions of England, a light coloured peppered moth Biston betularia was found on the bark trees. The tree bark was covered by whitish lichens, so light coloured moths escaped unnoticed from predatory birds.
After industrialisation, barks got covered by smoke, so the white moths were selectively picked up by birds. However, the black coloured moths escaped unnoticed against a dark background and became abundant.
However, in recent year, reduced industrial pollution has led to the growth of lichens again and thus, the population of light coloured moths is again increasing.
This evolutionary story of moths in England, thus reveals, that 'evolution is apparently reversible'