Context: One of the most spectacular examples of obligate mutualism is between the siboglinid tube worms and symbiotic bacteria that live at hydrothermal vents and cold seeps. The worm has no digestive tract and is wholly reliant on its internal symbionts for nutrition. The bacteria oxidize either hydrogen sulfide or methane, which the host supplies to them. These worms were discovered in the late 1980s at the hydrothermal vents near the Galapagos Islands and have since been found at deep-sea hydrothermal vents and cold seeps in all of the world's oceans.

Question: When were the worms found?
Answer: the late 1980s

Question: What does the bacteria give the worm?
Answer: nutrition

Question: What land is near the worms' first known location?
Answer: the Galapagos Islands

Question: From where do the host obtain the hydrogen sulfide or methane?
Answer: Unanswerable

Question: When were the Galapagos Islands discovered?
Answer: Unanswerable

Question: What is the relationship between the siboglinid tube worms and the hydrothermal vents?
Answer: Unanswerable

Question: When were the symbiotic bacteria discovered?
Answer: Unanswerable

Question: Where does the symbiotic bacteria get nutrition from?
Answer: Unanswerable