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Book lungs are specialized respiratory organs found in many arachnids such as spiders, scorpions, and some mites, representing an important adaptation to terrestrial life in this group. They are so named because their internal structure resembles the pages of a book. Each book lung consists of a sac-like cavity that opens to the exterior through a slit-like opening called a spiracle, usually located on ______ ____ __________ _________ _____.
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