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Characteristics of viruses -
1. They're non-cellular.
2. They're enclosed in a protective envelope.
3. Also Contain protein coat called capsid.
4. They've only a single type of nucleic acid core either DNA or RNA.
5. They don't respire, grow or metabolize but they do reproduce.
6. They're considered both living and non-living cause viruses are inactive state when present outside of host cells and active inside of host cell. 
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