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Industrial melanism is an evolutionary effect prominent in several arthropods, where dark pigmentation has evolved in a habitat affected by industrial pollution, including sulphur dioxide gas and dark soot deposits.
Natural selection is the idea that organisms that posses favorable traits that enable them to survive in their environment are the ones that live long enough to pass on these traits to their offspring.
<h3>What is natural selection?</h3>
The question is incomplete but I will try my best to explain the idea of natural selection.
The term natural selection refers to the idea put forward by Charles Darwin that organisms that posses favorable traits that enable them to survive in their environment are the ones that live long enough to pass on these traits to their offspring. This is also called the survival of the fittest.
Learn more about natural selection: brainly.com/question/2725702
No, because if their already formed, how would they get bigger