'Extremely varied' is the short answer. A full answer would require a long essay or a book.

That really depends on what the topic of your essay is.

If the essay is about The Pelican Brief then, yes, it would be extremely helpful to read it. If your essay is on a topic that is explored within The Pelican Brief then, again, it would be helpful to read it but it wouldn't be completely necessary.

A persuasive essay is written in order to convince the reader of a position or idea. A persuasive essay on the topic of volcanoes might discuss how volcanoes are extremely dangerous, and why people should not live near them.

Mariah was extremely proud of her essay especially since she had written it herself.

if you are writing an essay on it, its extremely hard im doing it right now and im lost