Which indicates that someone is addicted to psychoactive drugs? a. feelings of pleasure from normal activitiesb. taking the drug only when prescribedc. intense cravings for the drug when it is not availabled. feelings of pleasure that the person wants to repeat

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 of the following is true about vigorous intensity movements. playing single tennis or riding a bike on a hilly surface playing soccer riding bike on a flat surface playing double tennis or playing basketball all of the above

1. true or false decay destroys tooth enamel 2. true or false- tooth decay starts when plaque builds up on your teeth