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Answer:
D.) Giraffes having increasingly longer necks over time.
The best illustration of a result of natural selection is giraffes having increasingly longer necks over time.
WHAT IS NATURAL SELECTION?
Natural selection is process whereby living organisms become better adapted to their environment and tend to survive and produce more offspring over time.
Natural selection occurs spontaneously in organisms and serve as the basis for their survival in their environment. It is referred to as the survival of the fittest.
An example of natural selection is that of giraffes that develop increasingly longer necks over time.
Learn more about natural selection at: https://brainly.com/question/2725702