In the evolutionary story of moths in England, before industrialisation, it was observed that more white-winged moths on trees than dark-winged or melanised moths. But after industrialisation, there were more dark-winged moths in the same area, i.e., the proportion was reversed.
Before industrialisation period, the white moths survived because the tree bark was covered with white lichens, so they were unnoticed by predators.
In Post industrialisation period, the tree trunks became dark due to industrial smoke and soot. Under this condition the white-winged moth did not survive due to predators, dark-winged or melanised moth survived.
Hence 'evolution is apparently reversible'.
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