<P> Giant tube worms use bacteria in their trophosome to fix carbon dioxide (using hydrogen sulfide as an energy source) and produce sugars and amino acids . Some reactions produce sulfur: </P> <Dl> <Dd> hydrogen sulfide chemosynthesis: <Dl> <Dd> 12H S + 6C O → C H O (= carbohydrate) + 6H O + 12 S </Dd> </Dl> </Dd> </Dl> <Dd> hydrogen sulfide chemosynthesis: <Dl> <Dd> 12H S + 6C O → C H O (= carbohydrate) + 6H O + 12 S </Dd> </Dl> </Dd> <Dl> <Dd> 12H S + 6C O → C H O (= carbohydrate) + 6H O + 12 S </Dd> </Dl>

Where does the energy for chemosynthesis come from