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Malpighian tubules are excretory structures in insects that play a crucial role in osmoregulation and the elimination of metabolic wastes. They are slender, tubular organs, usually blind-ended, arising from the junction of the midgut and hindgut. The number of Malpighian tubules varies among insect species, ranging __________ ___ ________ ______ ______ _____ _____ ______ ________ ________.
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