To write a persuasive essay, you need an argument. Your primary reason for wanting to go somewhere on summer vacation would be called your "thesis." Put your thesis in your introduction, and then elaborate on it. You basically need three reasons, one for each body paragraph, and conclude your argument in the final paragraph, the conclusion. Hope that helps!
Answer:
It would have to be adolescents who have taken an interest in astronomy.
"They "lurk" in the shadows, "Mangling" stars and "gobbling" them up."
We can discuss it from many different points. However, since in this question we have to look at this only from 3 aspects, let's look at the cases of education, health and social security. In all cases, if people don't have an equal access to these basic services, they will face with problems. If you cannot have a proper education, you cannot get a better job and it will create financial instability in the future. If you don't have an access to the healthy services in case of food, sanitation and water, you will easily have health problems. If you don't have a social security, burglars will steal your possessions easily.
The main idea of the passage above from Cotton Mather's "The Wonders of the Invisible World" is to justify the outcome of the trials. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.