4. Fill in the gaps in these sentences:
1)Virology is often considered as a part of_______.
2)Viruses can be classified according to
______they infect.
3)Another classification uses the geometrical shape of their ____or the virus's structure.
4)A virus is a small _____that can replicate only inside the living cells of organisms.
5)Viruses are found in almost every _______on
216
Earth.
6)Viruses cause a number of diseases in
_______.
7)Viral infections in animals provoke
________that usually eliminates the infecting virus.
8)The evolution of viruses, which often occurs in concert with the evolution of their hosts, is studied in the field of_______.
9)While viruses ______and_____, they don't engage in metabolism and depend on a host cell for reproduction.
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