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Hemichordates show several affinities with echinoderms, reflecting their evolutionary relationship. One of the primary similarities is in the structure of the coelom. Both hemichordates and echinoderms possess a true coelom, which is divided into three distinct regions: protocoel, mesocoel, and metacoel, demonstrating a tripartite coelomic organization. _______ _____ ____ _____ __________ ______ ___ ____ ______ ____.
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