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Why are viruses not considered as a cell?Which kingdom do they belong to?

Basically because it does not have the things required to BE a cell, which is considered to be an organism. A virus is not considered an organism. The virus has a core of RNA or DNA which is surrounded by a protein coat. Unlike cells that can either go through mitosis or binary fission, viruses cannot replicate itself unless it is in a host cell.
They do not belong to any kingdom.


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