Context: The gut is generally an almost straight tube supported by the mesenteries (vertical partitions within segments), and ends with the anus on the underside of the pygidium. However, in members of the tube-dwelling family Siboglinidae the gut is blocked by a swollen lining that houses symbiotic bacteria, which can make up 15% of the worms' total weight. The bacteria convert inorganic matter – such as hydrogen sulfide and carbon dioxide from hydrothermal vents, or methane from seeps – to organic matter that feeds themselves and their hosts, while the worms extend their palps into the gas flows to absorb the gases needed by the bacteria.

Question: What type of annelids are tube-dwelling?
Answer: Siboglinidae

Question: What blocks the Siboglinidae's gut?
Answer: a swollen lining

Question: How much of a Siboglinidae's weight is symbiotic bacteria?
Answer: 15%

Question: What gases come from hydrothermal vents?
Answer: hydrogen sulfide and carbon dioxide

Question: What gases come from seeps?
Answer: methane

Question: What type of annelids are brain-dwelling?
Answer: Unanswerable

Question: What blocks the Siboglinidae's blood?
Answer: Unanswerable

Question: How much of a Siboglinidae's consciousness is symbiotic bacteria?
Answer: Unanswerable

Question: What liquids come from hydrothermal bottles?
Answer: Unanswerable

Question: What foods come from seeps?
Answer: Unanswerable