I'm not exactly sure, but I think this statement is true, although the antagonist can sometimes be a rival to the protagonist without knowing. It really depends.
By giving details on a character's personality, the author helps readers understand that character more accurately
https://study.com/academy/lesson/what-is-a-counterargument-definition-examples-quiz.html
On this website they have examples
Ok, so body paragraph 1 was amazing! However, I found somethings you might want to change in body paragraph 2. First, "He saw all the beautiful things around the swamp that surprised him. Until he found the rarest flower he could ever find." This could be changed a bit! So, is change it to, "Around the swamp, he saw many beautiful things that surprised him, until he found the rarest flower anyone could ever find." It just sounds a bit better, and you and your professor might like it, too! Everything else was amazing.
Information and important context clues