What are all living organisms on earth called? the answer is a six letter word.

ANIMAL. It's because animals are living organisms. Also 6 letters! A-N-I-M-A-L! 

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.