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Which of the following statements correctly describes one of Chargaff's rules regarding DNA?A: The percentages of adenine and thymine are roughly equal, as are the percentages of guanine and cytosine in the DNA of a given species.B: DNA base composition does not vary between species.C: The percentages of adenine and cytosine are roughly equal, as are the percentages of guanine and thymine in the DNA of a given species.D: DNA has a double helical structure.

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