Viruses are considered by some biologists to be a life form, because they carry genetic material, reproduce, and evolve through natural selection, although they lack the key characteristics, such as cell structure, that are generally considered necessary criteria for defining life. Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life" and as replicators.

You can read more about this in:
https://en.wikipedia.org/wiki/Virus
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5406846/
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