6) a long poem that retells the story of a mythical hero is called a
poem,

Epic

Explanation:

A long poem that tells the story of a mythical here is usually called an epic. Epics are long poems that were common in the ancient world. These poems usually tell the story of a hero and his or her adventures.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.