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Hydrothermal vents

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Giant tubeworms congregate in the thousands near hydrothermal vents. Riftia have no mouth or digestive tract, and can grow up to eight feet in length. They form symbiotic relationships with bacteria that live inside them. The bacteria convert hydrogen sulfide given off by the vents into organic molecules that nourish the worm.

PHOTO: Courtesy of Woods Hole Oceanographic Institution/Newscom/File

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