Chemoautotrophs TripleDot make their \"food\" using chemical energy and carbon dioxide. make their \"food\" using chemical energy and an organic source of carbon. make their \"food\" using sunlight and carbon dioxide. obtain energy from organic molecules. None of the above Solution Chemoautotrophs make their food using chemical energy sources and carbon dioxide. Purple sulphur Bacteria is one such example which uses hydrogen sulphide to prepare organic compounds. The ability to make their own food from chemicals enable them to live in extreme conditions like sulphur pools, hot springs ,acidic environment etc..