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In insects, gaseous exchange is essential for supplying oxygen to tissues and removing carbon dioxide. Terrestrial insects primarily rely on a tracheal system, which consists of a network of air-filled tubes called tracheae that branch into finer tracheoles reaching individual cells. Air enters the tracheal system through openings called spiracles, which can open and close to regulate _______ ______ ______ ____ _______ _____ __________ _________ ____ __________ _______.
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