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OpenStudy (anonymous):
Nucleotide substitutions occur by mistake in a segment of ribosomal RNA at a constant rate of one substitution every 10,000 years. A biologist has compared the ribosomal RNA of two modern-day species and found that they have six differences in their sequences. How many years ago did these species diverge from a common ancestor? 3,000 years ago 60,000 years ago 30,000 years ago 6,000 years ago
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