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Jun23-09, 11:09 PM
Life is a borderline unit of lifeform. The exactly sit the border of the quick and the dead.
they do reproduce using a host cell
they are self contained
they understand the presence of a potential host cell
They are not self-contained. The virus unit itself is not enough to metabolize or meet most of the other criteria for life.
They do not "understand the presence" of a potential host cell. The chemistry to enter a cell either works or does not.