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> By definition, viruses aren't alive, and amoebas are.

Interesting, I thought we don't have a definition for "alive".

There's no universally accepted definition but most biologists would say that viruses are not alive because they lack metabolism.

right they are "not alive", but do have a "life cycle".

How else would one define what a single log reduction (one tenth of virus particles surviving) means per given "UV dose" or fluence.