Read the revised conclusion of an informative essay. the invention of the printing press was a turning point in history. in addition to increasing the availability of books and the spread of new ideas, it also led to significant political change and radical changes to the religion of europe. this forever altered the course of history. which best states why the conclusion is effective? it summarizes key points and restates facts. it restates facts and uses parenthetical citations. it summarizes key points and adds new facts. it restates facts and uses an informal tone.