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Common ancestry and continuing evolution

Problem

The following table lists evolution rate estimates for a set of viruses. The evolution rates are measured as the number of base-pair substitutions per nucleotide site in the virus genome, per year (s/n/y).
Virus nameEvolution rate (s/n/y)
Norwalk virus4.97 x 103
SARS coronavirus2.82 x 103
Human rotavirus A1.66 x 103
West Nile virus0.85 x 103
Human hepatitis B virus0.43 x 103
Human adenovirus B0.07 x 103
Which of the following claims is best supported by the data in the table?
Choose 1 answer:
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