Vaccines development testing and xxx i need 1 word for xxx that will mean how vaccines work/ thanks

What do the excerpts have in common? both point out the tragic nature of situations in which children make journeys without their parents. both describe what immigrant children must do to survive when traveling to the united states. both explain why most children want to leave central america without their parents. both indicate the tragic problems and their consequences that children in central america must face.

Certain predictable elements of beowulf, such as the superhuman hero and the quest to defeat evil, are common to the form. a. story b. plot c. epic d. novel

Why are danforth, hathorne, and the other authorities so resistant to believing the claim that abigail and the other girls are lying?