How are fiction and non-fiction similar?

A biography usually tends to be based on someone's life such as a celebrity. An example of a non-fiction would be a history textbook, it recounts events that actually happened.

Non-fiction is a book with factual information. Some books, such as comic books or poetry are classified as non-fiction regardless.

Unless you've seen any vampires stalking around lately, no.

Mermaids are a fiction topic. They were first introduced when Greek fishermen caught sight of dugongs, but mistook them for young maidens with the top half being human features, but the bottom half...