Ead the section "New Shoes Changing The Sport." Which selection from the section supports the conclusion that not all runners benefit equally from the Vaporfly's technology? A Research showed the shoes improved the way runners use energy by an average of 4 percent. B Tucker pointed to studies showing that some runners respond to the shoes' technology more effectively. C He said Nike could have been clearer as it developed the Vaporfly. D Orr said that early on, people saw incredible results with the Vaporfly.

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.