Every organism is alive only in a certain medium. Viruses "come alive" in a host, e.g. a human body, or in solution. Humans are live only in Earth's environment

Every organism is alive only in a certain medium. Viruses "come alive" in a host, e.g. a human body, or in solution. Humans are live only in Earth's environment. There is no life without the context of the broader environment that it can live in.