A virus is a parasite that multiplies in a host cell. Some viruses multiply in their nucleus, others in the cytoplasm, and others in the nucleus and in the cytoplasm. When a virus in a host cell reproduces its own kind, it is an organism. So the virus is a form of life of the body. The structure of the virus, represented by its interacting main parts (nucleic acid and proteins), structural certainty (core and protein coat – capsid), its maintenance of its structure make it possible to consider the virus as a special living system – an organism-level biosystem.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.