Which action should be taken to slow the flow of blood from the wound of someone who is bleeding?

a. keep the wounded area below waist level.

b. have the person lie flat on the ground.

c. raise the wounded area above the level of the heart.

d. keep the wounded area at knee level.

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.