Which of these statements BEST describes the synergistic interaction effect? A. an interaction where two or more medicines taken together have no effect on one another B. an interaction between two or more medicines that increases their effectiveness C. an interaction where two or more medicines taken together produce an unexpected result D. an interaction between two or more medicines that decreases their effectiveness Please select the best answer from the choices provided. A B C D

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.