Why do some people consider viruses as non-living things?

Explanation

### Step-by-Step Solution:

1. **Definition of Viruses**: Begin by understanding what viruses are. Viruses are microscopic agents that are smaller than bacteria and can only replicate inside the living cells of a host organism.

2. **Lack of Metabolism**: Viruses do not have metabolic processes when they are outside a host. Unlike living organisms, they do not consume energy or carry out any biological functions on their own.

3. **Dependence on Host Cells**: Viruses require a host cell to replicate. They invade a host's cells and hijack the host's cellular machinery to reproduce. This means that outside of a host, viruses are inactive and cannot reproduce.

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