There are many tube worms that do have digestive tracts, but I assume you are talking about chemosymbiotic tube worms that are found in methane seeps and hydrothermal vents. These guys essentially live in farts (hydrogen sulfide, methane), which their symbionts use for chemosynthesis.
There are many tube worms that do have digestive tracts, but I assume you are talking about chemosymbiotic tube worms that are found in methane seeps and hydrothermal vents. These guys essentially live in farts (hydrogen sulfide, methane), which their symbionts use for chemosynthesis.