You: That definition doesn't work. A virus, for example, seems to be alive but it never grows.

Aaron: That is because a virus is not alive.

You: How can you say a virus isn't alive? It can reproduce, it can move.

Aaron: I would say that a virus is a machine of nature an nothing more. It does not have a will but simply reacts to its surroundings.

You: How can you say whether or not something has a will when it exists on such a small scale? Would you say that an amoebae has a scale? A plankton?

Aaron: Indeed I would. They meet the criteria of my definition.