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In page Marine worm:
"This quality is also observed in deeper oceans, where tube worms that use respiratory plumes with tentacles perform gas exchange of hydrogen sulfide and methane around hydrothermal vents. These types of circulatory systems differ from marine worms previously mentioned that can perform gas exchange through their entire bodies. This synapomorphy of gas exchange causes even related terrestrial annelids to be restricted to moist environments.[citation needed]
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