Evolution considered a scientific theory because it is supported by scientific data. Thus option D is correct.
What is evolution ?
A change in the characteristics of a species over several generations due to various cause such as natural selection.
Evolution has different components such as Natural Selection, Macro-evolution, and Micro-evolution.
Natural selection is the method that drives evolution of a species. The organism can undergo adaption in a given habitat to increase the survival rate more than others.
Several factor can influence evolution such as gene flow refers to change in allele frequency in a population due to immigration and emigration.
secondly genetic drift refers to an existing population produces a new and smaller population with less variation in a random manner.
Mutation also add a favorable allele leads to increase in frequency in a population.
Sexual selection refers to selection of successful trait for mating which increase the frequency.
Thus option D is correct.
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