Here's why:
* Science Fiction: The book revolves around the discovery of a previously unknown dinosaur population on a remote island, utilizing scientific concepts and plausible explanations for their survival.
* Adventure: The story follows a group of characters on an exciting journey to this island, facing challenges and encountering dangerous creatures.
* Thriller: The book features suspenseful scenes, perilous situations, and the threat of danger from the dinosaurs.
While it doesn't solely fit into one category, science fiction is the most accurate primary genre for "The Lost World."