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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 water loss and gas exchange. Diffusion is the main mechanism for gas movement in small _____ ____ _____ ___ _________ ___.
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