Scientist over many generations of extensive research have come up with the conclusion that viruses are not living organisms. Viruses lack the ability to metabolize, meaning they can not reproduce themselves. In order for a virus to live and reproduce it must find a suitable host cell. Once they have found its suitable host cell they may take it over and use metabolize on behalf of its host's already living material. A virus cannot live more than 48 hours away out of its host cell which is another reason why scientist believe viruses are not alive. "Viruses are not classified as being alive because they don’t have their own machinery for reproducing. They can only take over the machinery of cells, turning them into virus factories" said a scientist from UCSB Science Line. In conclusion viruses are thought of as non-living because they lack most of the criteria that scientist evaluate living things on.
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