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Although they reproduce, they can only do so only by entering a host cell and making use of its machinery for replication. Viruses are bits of genetic material, apparentlyderived from their hosts. Thus, as Margulis and Schwartz (1988) put it, the polio and flu viruses are probably more closely related to people, and the tobacco mosaic virus (TMV) to tobacco, than polio and TMV are to each other |
