Viruses
The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities

among different viral hosts than between viruses and their hosts
among different viruses than between viruses and their hosts
among different viral hosts than among different viruses
between viruses and their hosts than among different viruses

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Viruses
The oncogene theory refers to

how viruses replicate in host cells
none of these
how chemicals inactivate viruses when applied
how viruses transform normal cells into tumor cells

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