If one organism lives on or in another and gets its energy by harming the other, their relationship can be said to be A. competitive
B. beneficial
C. positive
D. parasitic

The answer is c i just finished taking the test

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.