Why is it necessary to give the hpv vaccine in multiple doses? the hpv vaccine contains poorly immunogenic antigenic fragments. the hpv vaccine mimics the actual infection from hpv. the hpv vaccine does not replicate in the host. the hpv vaccine must be administered to multiple portals of entry to provide protection at each portal?

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.