........ is a living chemical.

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(D) virus is often described as a 'living chemical' because it exists at the boundary between living and non-living matter. Outside a host cell,a viru

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Virus

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(D) virus is often described as a 'living chemical' because it exists at the boundary between living and non-living matter. Outside a host cell,a virus is inert and behaves like a chemical molecule (a nucleoprotein complex). Once it enters a living host cell,it utilizes the host's machinery to replicate,thereby exhibiting characteristics of life. Therefore,the term 'living chemical' is most appropriately used to describe a virus.

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