Industrial melanism is an example of:

Step-by-step solution

One of the most striking examples, which demonstrates the action of natural selection, is the industrial melanism in England. The peppered moth Biston betularia , with a dull grey colour, was abundant in England before the industrial revolution. A black coloured form of the same moth (melanic, a dominant mutant differing in a single gene), Biston carbonaria , was very rare. After industrial revolution, the proportion of Biston carbonaria , increased to almost 90 percent.