Final answer:
A virus is a sub-microscopic infectious agent that relies on host cells for replication and is not a living organism.
Explanation:
A virus is a sub-microscopic infectious agent that consists of genetic material (DNA or RNA) surrounded by a protein coat called the capsid, which protects the genetic material. Viruses are not living organisms as they lack the capability of self-replication and rely completely on host cells to reproduce. They infect various life forms, including animals, plants, and microorganisms like bacteria and archaea.
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