How are bacteria classified according to the production of organic material for the energetic metabolism?
Most bacteria are heterotroph, they do not produce their own food. There are also autotroph bacteria: chemosynthetic bacteria or photosynthetic bacteria.
Some photosynthetic bacteria, like cyanobacteria, make photosynthesis like plants do, using water. Others, the sulfur photosynthetic bacteria, use hydrogen sulfide (H2S) instead of water.