Many people feel that being overly focused on personal fitness can lead to unhealthy body expectations, eating disorders, or a skewed self-image. How might some of these negative side effects occur if someone was to become too obsessed with personal fitness? Elaborate on some of the possible negative outcomes mentioned–unhealthy body expectations, eating disorders, or a skewed self-image–and how they could be avoided.

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.