Polydactyly is the condition of having extra fingers or toes. some polydactylous persons possess extra fingers or toes that are fully functional, whereas others possess only a small tag of extra skin. this is an example of

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.

Which one is not a part of the base of the cranial cavity? a. scala anterior b. scala media c. scala lateralis d. scala posterior

Which do you focus on to lower your set point