Industrial melanism is an example of : -

Industrial melanism was observed in the peppered moth (Biston betularia) in England.
Before industrialisation, tree trunks were covered with pale lichens, and the light (white) moths were camouflaged, while dark (melanic) moths were easily picked off by birds.
After industrialisation, soot killed the lichens and darkened the tree trunks. The dark moths now matched the background, escaped predation, and became common, while light moths became rare.
So the moths that resembled their surroundings were protected from predators and selected. It is not a darkening of the skin by smoke.
So industrial melanism is an example of protective resemblance with the surroundings (natural selection).