Quote:
Originally Posted by ThaVirus
I've actually read that viruses aren't alive at all; they're just strands of DNA or RNA encased in a protein shell. They can't even reproduce without invading a living host first..
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"Viruses exist in two distinct states. When not in contact with a host cell, the virus remains entirely dormant. During this time there are no internal biological activities occurring within the virus, and in essence the virus is no more than a static organic particle. In this simple, clearly non-living state viruses are referred to as 'virions'. Virions can remain in this dormant state for extended periods of time, waiting patiently to come into contact with the appropriate host. When the virion comes into contact with the appropriate host, it becomes active and is then referred to as a virus. It now displays properties typified by living organisms, such as reacting to its environment and directing its efforts toward self-replication".
So it's not "Alive" in the same sense that you and I consider ourselves alive. But it satisfies enough criteria by reacting to its environment and promoting replication to be considered living by the most basic interpretations of "Life". Would you consider a tree to be "Alive"? It can't reproduce until coming in contact with a "Host"(soil, water, minerals).