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The thorax in insects is a distinct and specialized body region responsible for locomotion, consisting of three segments: the prothorax, mesothorax, and metathorax. Each segment bears a pair of legs, and the meso- and metathorax may bear one pair of wings each. However, the degree of development, fusion, and specialization of these segments varies widely among insect taxa, reflecting adaptations to their habitats and modes of life. In primitive wingless insects such as those in the order Apterygota (e.g., silverfish and bristletails), all three thoracic segments are nearly uniform, and there is little specialization ________ _____ ______ _____ ____ ___ _______ _______ _____ ________ ________ ___.
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