Before viruses can reproduce, they must 

      A. replicate the contents of their nucleus.  B. undergo binary fission.  C. infect a host cell.  D. initiate the cell cycle. ​

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Before viruses can reproduce, they must infect a host cell.

Viruses need a way to enter the body before they can infect a host cell.

Before viruses can reproduce, they must infect a host cell.