Viruses are considered non-living because they can crystallize. Unlike living organisms, viruses are not cellular and can exist in a crystalline form outside of host cells, remaining inert until they infect a host to reproduce.
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Viruses are considered to be a transitional group between living and non-living. They exhibit properties of life, such as replication, only when inside a host cell, but are inert and lack cellular structure outside of a host.