How does the population change in peppered moth, Biston betularia, explain natural selection?

Populations of peppered moth Biston betularia of England underwent directional selection during and after industrialisation. The selective agent causing the change was/were

How does nature depollutes the air?

The change of the lighter coloured variety of peppered moth, Biston betularia, to its darker variety (carbonaria ) is due to :

Taking an example of white-winged moths and dark-winged moths of England in per and post industrialised era, explain evolution by natural selection .

Three forms of the peppered moth, (Biston betularia), namely the melanic form, the pale form and a form intermediate between these two, are found in Britain today. The melanic form was first observed in 1848 and its frequency subsequently increased, this is thought to be the result of

The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria)is due to