There are four major eubacteria groups, which are dependent on their food sources. use sunlight to receive their nutrients and absorb carbon from the soil.(Photosynthesis) Chemoautotrophs use inorganic chemicals as a source of energy and often absorb carbon from soil. Photoheterotrophs produce carbon from organic materials and use sunlight. Chemoheterotrophs consume carbon in the same way as photoheterotrophs, while organic chemicals make up their energy supply.