Bacteria that live around deep-sea, hot-water vents obtain energy by oxidizing inorganic hydrogen sulfide belched out by the vents. they use this energy to build organic molecules from carbon obtained from the carbon dioxide in seawater. these bacteria are

The bacteria are chemoautotrophs. These microorganisms make use of molecules that are inorganic for energy and using carbon dioxide for carbon source. The process of obtaining energy is called chemosynthesis which uses molecules like hydrogen sulfide, ferrous iron, ammonia and the like. 

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