On the Carbon Source of Autotrophs
Autotrophs use inorganic carbon as their carbon source. "Yi" said: "The greatness of heaven and earth is called life." All things survive in heaven and earth, and autotrophs find a unique way to turn inorganic into organic, so as to form the basis for their survival and reproduction.

Autotrophs either perform photosynthesis or chemical energy synthesis. Those who perform photosynthesis, such as green algae and higher plants, borrow the power of light energy to phase carbon dioxide with water, and generate sugar and oxygen. Among them, carbon dioxide is also a genus of inorganic carbon. And chemical energy synthesizers, such as nitrifying bacteria, although they do not see light, use the energy released by the oxidation of inorganic matter to convert carbon dioxide into the organic matter they need.

In nature, inorganic carbon, such as carbon dioxide, fills the atmosphere or dissolves in water. Autotrophs are like craftsmen of nature. They ingest this inorganic carbon and build their own bodies through exquisite biochemical processes. They also provide food and oxygen for heterotrophs and maintain ecological balance. Therefore, inorganic carbon in autotrophs is as indispensable as flow and wood.