Is virus a living or non-living thing?
Viruses are not made of cells and they do not reproduce themselves from other pre-existing viruses.
According to the cell theory, the cell is the basic unit of structure and function of living things, and all cells come from oher pre-existing cells by the process of cell reproduction.
Viruses are not composed of cells and do not reproduce themselves from other pre-existing viruses. The genetic material (DNA or RNA) inside the virus takes over the living host cell, and causes the cell to replicate virus parts and assemble them to make new viruses, which are released to infect more cells.