Emily and charlie are 1-year-old twins. their parents thought it would be fun to have a portrait taken of their young children with santa claus. both parents are close by as their twins are placed on santa's lap, but emily and charlie are very unhappy about the entire experience and show their alarm with tears and cries. why?

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.