The correct answer is D. The revolution speed may indicate whether dark matter is present.
Question 26 What connection does the author draw between the revolution speed of galaxy clusters and dark matter? (Paragraph 4) A. The revolution speed can result in new dark matter. B. The revolution speed can result in a loss of dark matter. C. The revolution speed makes it difficult to see dark matter. D. The revolution speed may indicate whether dark matter is present.
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