how do u know charmed life caitlin's lucky charm is fiction?

how do u know charmed life caitlin's lucky charm is fiction?

I don't know that book, but you know something is fiction when it's something that simply can not happen in real life, also if it's based on a character, like Sammy took a bath when he finished playing soccer, unlike dolphins are mammals, which is nonfiction.
Hope this helps!
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