Microorganism: A microorganism that is smaller than a bacterium that cannot grow or reproduce apart from a living cell.
Answered 12/9/2012
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Virus: A virus is a small infectious agent that can replicate only inside the living cells of an organism. Viruses can infect all types of organisms, from animals and plants to bacteria and archaea.
Answered 4/26/2013
5.3k views
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