When scientists classify living things, they do not include viruses. this is because viruses

The correct answer is- Viruses can not reproduce by their own.

Viruses are non cellular, microscopic, infectious, non living agents, primarily composed of nucleic acid ( which could be DNA or RNA) that is surrounded by a coat of protein called capsid. They are not composed of cell and can not produce energy by themselves.

They lack a machinery for replicating their genetic material and therefore require a body of specific host ( such as bacteria) where they can replicate their genome and produce more viral copies.

Thus, scientist do not include virus while classifying living things.

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