Between heaven and earth, everything depends on carbon sources, energy sources and electron donors to live. Carbon sources are the foundation of life, and all kinds of substances are synthesized, and they are required as materials. Energy sources are also the source of power, driving various changes in life activities, so that all things can be metabolized and grown. And electron donors are indispensable in biochemical reactions, related to the delicate process of energy transfer and material transformation.

Looking at nature, carbon sources are diverse in form, or inorganic carbon dioxide, which is ingested by photosynthetic organisms and incorporated into the organic process; or organic sugars and lipids, which are distributed in heterotrophic organisms. Energy is not single. Light energy shines brightly, and photosynthetic organisms use it to hydrate carbon dioxide and water into energy-storing organisms. Chemical energy is stored in the chemical bonds of substances, oxidized by organisms, and released to meet the needs of life. Electron donors also have their own types. They play key roles in different biochemical pathways and maintain the orderly operation of life.

Biologists use carbon sources as the body, energy as the use, and electron donors as the link to build a complex and delicate life network. Carbon sources are the basis to build the framework of the building of life; energy drives, so that everything in the building runs continuously; electron donors shuttle through it, coordinating all parties, so that life activities are harmonious and orderly. The three complement each other and are indispensable to build the vitality and vitality of all things in the world.