What challenges do vaccine makers face in their attempts to produce an effective vaccine against the flu?A. Workers like having an excuse to miss work, so they try to prevent a good vaccine from being made. B.They have to predict which strains of flu will become active months before the flu season begins. C.People tend to resist getting shots, so the majority of the population does not get vaccinated. D.They cannot hire the most qualified employees because there is so little profit in making vaccines.

Read the sentence. on days when i go jogging in the morning, my mind seems to process ideas faster, and my mood is more positive. how does the underlined clause add variety and meaning to the sentence? select two options. it describes the days being discussed. it makes readers want to go jogging. it creates a compound-complex sentence. it adds detail about the speaker's personality. it explains why jogging is beneficial. save and exit next submit mark this and retum

What do u think u might go with a bestfriend that u don’t do with everyday friends( school friends)

The story line remains the same. the kids live in what was then one of the remaining beachfront slums, down the coast from the expensive malibu area. the beach was ruled by surfers, but in the afternoon, when the waves died down, some of the surfers, or their younger brothers, fooled around on skateboards. one day, skip engblom, the shop owner, comes up with a key breakthrough, polyurethane wheels: "they grip." with the additional traction, the z-boys try skating the sides of the big, open drainage canal that runs through the area. then comes a brainstorm: because of a drought, the area's swimming pools were drained. the kids started "borrowing" pools when the owners weren't home, to skate the curved sides.” where did “the lords of dogtown” originally practice their tricks? a. the beach c. an open drainage canal b. empty pools d. none of these