Science literature is often held back by facts, where you can express yourself, like an expository essay since they are held back by facts as well. Plain fiction is all up to the author with nothing holding them back, like an argumentative essay would be since it’s opinionated.
Yes it is becase a Metaphor is The use of a word or phrase to refer to something that it is not, invoking a direct similarity between the word or phrase used and the thing described (but in the case of English without the words like or as, which would imply a simile); the word or phrase used in this way; an implied comparison.
Yes, it is. The answer is true.