The viruses carry genetic information and are able to reproduce inside a host cell. They also can mutate for a better adaptation to the environment. But they still lack their own cells, so we cannot call them living creatures. As long as a virus is outside a host cell, it is just a protein ball with RNA chain hidden inside.
Scientists define viruses as non-cellular forms of life or, in other words, objects at the edge of life. In this case we have something between a bacteria and a piece of protein.
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