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Final answer:The theory of evolution is a well-supported scientific explanation for the change in characteristics of living populations over time through natural selection.Explanation:The theory of evolution by natural selection is more than just an educated guess or a single scientist's opinion. It is an overarching explanation, thoroughly supported by a wealth of evidence, for how populations of living things change over time.Evolution occurs through a process known as natural selection, where individuals with advantageous traits are more likely to survive and reproduce, passing these traits to subsequent generations. Over time, this process can result in significant changes in the characteristics of living creatures. Therefore, the correct answer to the description of the theory of evolution is D) an overarching explanation, supported by much evidence, for how populations change over time....