First of all, both are ecological terms. Self-reliance is simply to support yourself. Autotrophic organisms live and reproduce by inorganic nutrition. They use the energy obtained from chemical dark reactions such as respiration or photochemical reactions for carbon assimilation. Autotrophic organisms are divided into chemoautotrophic organisms and photoautotrophic organisms. Representative examples of autotrophic microorganisms are red sulfur-free bacteria, red sulfur bacteria, green sulfur bacteria, nitrifying bacteria, sulfur bacteria, hydrogen bacteria, iron bacteria, carbon monoxide bacteria and so on. In autotrophic microorganisms, such as hydrogen bacteria, with the substitution of available electron donors (for example, acetic acid is produced from hydrogen), it can sometimes be seen that carbonic acid assimilation replaces the reductive assimilation of organic nutrients (acetic acid, etc.). ). The same mechanism of carbon fixation cycle and energy harvesting system, as well as the regulation mechanism of autotrophs on the adaptive function of organic matter are being compared with photosynthetic organisms in order to clarify biochemically. Heterotrophication is a way of life corresponding to autotrophy. Heterotrophs refers to those organisms that can only use the ready-made organic matter in the external environment (organic matter is produced by autotrophs) as energy and carbon sources, ingest these organic matters into the body, convert them into their own components, and store energy. Such as: fungi living in saprophytic and parasitic life, most kinds of bacteria and higher animals and plants.