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Quiz -- Another Year of COVID-19, Variants and Restrictions
December 14, 2021
Question 1 / 4
What does the story say about how viruses change?
Viruses that do not change spread widely.
Mutations may help viruses to spread more easily.
Viruses rarely change over time.
Mutations usually make the virus weaker.
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Quiz -- Another Year of COVID-19, Variants and Restrictions
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