I would say C but I’m not too sure.
The answer bnb is true becuase without desity in anything nothing would circulate

A prophage is a bacteriophage (often shortened to "phage") genome inserted and integrated into the circular bacterial DNA chromosome or exists as an extrachromosomal plasmid. This is a latent form of a phage, in which the viral genes are present in the bacterium without causing disruption of the bacterial cell.
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Mass is the amount of matter in any object.