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Nematodes, or roundworms, are considered more advanced than flatworms due to their more complex body structure and physiological features. They possess a complete digestive system with a distinct mouth and anus, allowing for more efficient nutrient processing. Additionally, nematodes have a more developed muscular system and a pseudocoelom, which provides better organ organization and function. Furthermore, their cuticle allows for greater adaptability to diverse environments compared to the simpler body plan of flatworms.

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