Viruses refer to infectious microscopic organisms that multiply only in living cells of animals, plants, or bacteria. They replicate themselves by integrating into the cell. When this happens, the virus uses the cell's chemical machinery to keep itself alive. Viruses are responsible for causing many diseases such as measles, chicken pox, common colds, SARS, and COVID-19. In conclusion, viruses are microorganisms that harm other living things.
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Answer:
Why viruses are only able to multiply in living cells?
Viruses cannot reproduce outside a living cell because they lack the cellular organization and independent machinery which is required for the reproduction and other metabolic activities. They can only multiply inside the living cell of host by using host's cellular machinery.