Viruses
Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of

self-duplication
multiplication
duplication
self-replication

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

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

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