viruseswhether
Viruses are microscopic infectious agents that can only replicate inside the living cells of other organisms. They are not considered living organisms themselves because they lack the cellular machinery to reproduce independently. Viruses are found in nearly every ecosystem on Earth and are the most abundant type of biological entity.
The structure of a virus is generally simple, consisting of genetic material (DNA or RNA) enclosed within
Viruses infect a wide range of hosts, including animals, plants, fungi, and bacteria. The process of infection
Viral infections can cause a variety of diseases in humans, such as the common cold, influenza, HIV/AIDS,