The most accurate statement about evolution among the options provided is:
Living things have adapted and changed over time for specific, discoverable reasons.
This reflects the understanding that evolutionary processes, such as natural selection and genetic drift, lead to adaptations in organisms over time, and these processes can be studied and understood through scientific methods.
The other statements are inaccurate because:
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DNA is not the only evidence supporting the theory of evolution; there are many types of evidence, including fossil records, comparative anatomy, and embryology.
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Animals, plants, and microbes share common ancestors as evidenced by molecular and genetic studies, indicating they are related through evolutionary pathways.
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Scientists continue to study evolution to further understand its mechanisms and effects; science is always evolving and adapting as new information becomes available.