Answer:
During reproduction (also inaccuracies in DNA replications), many variations occur in the offspring. Some individuals have more favourable variations than the other. Such individuals survive and pass these variations on their progeny. For example, let us consider the population of beetles. Due to certain conditions, a colour arised during reproduction so that one beetle is green in colour (instead of red). This beetle can pass this colour to its progeny. Crows now cannot see these green-coloured beetles on green leaves and hence, their population become more than that of red-coloured beetles.
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