define fungal cell wall and it's composition and also it's functions
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A virus is a small infectious agent that duplicates itself
inside another living being. Viruses do not have their own
metabolism and require a host cell in order to reproduce (make
copies of themselves). They appear in a variety of sizes and
shapes and can only be seen with special microscopes. Viruses
are much smaller than bacteria and have a diameter between 20
and 300 nanometers. Coronaviruses are a group of viruses first
discovered in the 1960s that mainly cause respiratory tract
infections in humans. The best way to protect yourself is to avoid
being exposed to the virus.
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