Answer:
The inclusion of reputable sources and specific facts.
Step-by-step explanation:
This paragraph is in the format of a persuasive article. If you have the opinion of other humans, specifically from students and teachers then you can better understand both sides. When an article does not have these elements and it is persuasive in some form, then the grip the author has on the reader isn't really strong, and tends to make readers ask: "Says who?"