Translations:Adventist Youth Honors Answer Book/Nature/Bacteria/56/en
From Pathfinder Wiki
Chemoautotrophs (chemical-self-feed) are those that can produce their own organic compounds, but do not necessarily need sunlight as a precursor. Some of the bacteria at the base of the food chain near deep sea hydrothermal vents are chemoautotrophs. Different chemoautotrophs utilize different “foods,” including iron, ammonia, nitrite, sulfur and hydrogen gas. Some of the most important are those that can convert nitrite (NH3) into a form of nitrogen that plants can absorb. This process is called nitrification, or more commonly nitrogen fixing. Some bacteria capable of fixing nitrogen are considered chemolithotrophs, able to effectively live on rock as a substrate.
