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

You have studied the story of Pepper moths in England. Had the industries been removed, what impact would it have on the moth population? Discuss.

State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks/ during industrialization period in England).

The scientists believe that evolution is gradual. But extinction, part of evolutionary story, are 'sudden' and 'abrupt' and also group- specific. Comment whether a natural disaster can be the cause for extinction of species.