Answer:
it is a myth because, it is a traditional story story concerning early history of people or phenomenon that involves a supernatural being and event.
Step-by-step explanation:
the definition of myth is "a traditional story, especially one concerning the early history of a people or explaining some natural or social phenomenon, and typically involving supernatural beings or events." which fits perfectly with the story. the story also has no scientific evidence of the actual ark, and the story is very unlikely with major flaws.