What role does the dialogue play in this excerpt from The Hound of the Baskervilles by Sir Arthur Conan Doyle?

Can someone me with my essay? editing?

Read this passage. my career in journalism has taught me the challenges of capturing sporting events, yet gregor powell's descriptions are flawless. powell is a gold-medal paralympic swimmer, but his memoir proves that his true strength is the power of his insights. what feature distinguishes this passage as a foreword?

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.