does anyone have that feeling where you talking about how you prefer to listen to depressing songs and they're like "who the frick listens to depressing songs?" and your like bruv you don't know what its like to be me so dont be sayin nun but you dont say it because they're your first friend in a long time, and you dont wanna mess it up, so you just keep it in? yeah, me too.

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.