Питання 8 з 50

What is the common feature of both influenza viruses and coronaviruses mentioned in the text?

1. A They are always slow-spreading viruses
2. B They are unrelated to pandemics
3. C They are caused by bacteria
4. D They are resistant to vaccines
5. E They can conceal their identity through mutation

Правильна відповідь: E. They can conceal their identity through mutation