Each of these threads = dramatic action, character emotional development and thematic significance runs through every great picture book, middle grade fiction, young adult and adult novels whether genre or literary, all memoirs and screenplays.
All other plot lines are determined by age and type of story. However, one other plot line is in most stories, other than picture books and middle grade fiction = romantic plot line.
The 5th step in the Plot Series of How Do I Plot a Novel, Memoir, Screenplay? covers this 4th plot line. Hope you'll visit and follow along.