When incorporating direct quotations into a writing, what is the function of parentheses?

(important to read ender's game before answering) in what ways can people be both intelligent and foolish at the same time? how does the author show ender’s intelligence enabling him to fight against authority? make sure your ideas are well-organized and clear. review your word choice and make sure supports your purpose. edit by correcting errors in spelling and grammar and give your work a final polish.