Respiration in cyclostomes

Cyclostomes, which include lampreys and hagfish, are primitive jawless fish that exhibit unique respiratory adaptations. They possess gill slits instead of gills with operculum, a feature present in most higher vertebrates. Respiration in cyclostomes occurs primarily through their gills, and their respiratory system is adapted to __________ ___ ________ ________ ________ _________ _____ ____ __________ ______ _____ ___.
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