For questions about infectious agents that alter existing systems in order to reproduce.

Viruses are infectious agents that alter existing systems in order to reproduce in great numbers. They tend to be relatively simple, and rely on the host's own resources; they cannot operate without the right systems available.

Viruses have been observed manipulating the code of the systems they inhabit, adding new information and sometimes borrowing what is present. They can be extremely detrimental when present in abundance or for a long period of time.

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