The author's purpose is

An author's purpose is his reason for or intent in writing. An author's purpose may be to amuse the reader, to persuade the reader, to inform the reader, or to satirize a condition. ... To relate a story or to recount events, an author uses narrative writing.

Explanation:

be sure to give me brainliest

a myth is something that is told for many years that u go looking for and cant find and a truth is something that u can find in real life and can be story's of for example:

mermaid's and unicorns: u can't find them at all so they can be a myth cause u hear story's about them once u go looking for them u won't find them.

dinassours(can't spell): u hear story's about them at school by ur friends and one day ur dad takes u to a museum and u find fossils of them so u realize they are real and not fake.