What are microscopic unicellular, prokaryotic organisms that move through the Earth doing both good and harm? a. Protists
b. Eubacteria
c. Fungi
d. Archaebacteria

I think A or C. Not so sure though so if someone else answers go with their answer!

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.