The Last Universal Common Ancestor (LUCA), the theoretical single organism from which all life on Earth descends, is now ...

These bacteria thrive in food, soil, or water. Autotrophic bacteria create their own food through photosynthesis or chemosynthesis. These processes use sunlight, water, and carbon dioxide or ...

A second autotrophic pathway (Arnon–Buchanan cycle) uses a reductive citric acid cycle and is found in anaerobic or microaerophilic bacteria and archaea. A third autotrophic pathway (Wood ...