"On Carbon and Nitrogen Sources Required for Life"

All living things in the world depend on carbon and nitrogen sources for their survival. Carbon is the foundation of life, and the structure of all things depends on it. For example, all kinds of organic matter, from the tiny cells to the towering trees that cover the sky, all contain carbon. In biological metabolism, it is like the wheels of a car and the caravan of a boat. It is an indispensable base material for the transfer of energy and the synthesis and decomposition of matter.

Nitrogen sources are also not ignored. Nitrogen is an important group of proteins and nucleic acids, which is related to the transmission of genetic information and the maintenance of biological functions. Without nitrogen, protein is difficult to form, and the growth of cells and the transportation of the body are wasted. Looking at the earth, or taking nitrogen from the soil's nitrate nitrogen and ammonium nitrogen, or borrowing the power of nitrogen-fixing organisms to turn the free nitrogen in the air into a usable state.

In the process of biological evolution, each adapts its own method to obtain carbon and nitrogen. Photosynthetic organisms use light as a blade to convert carbon dioxide into carbon in their bodies; heterotrophs consume organic carbon sources from other things. Nitrogen sources are also diverse, either eating nitrogen-containing foods, or symbiotic nitrogen-fixing bacteria.

Therefore, it is known that carbon sources and nitrogen sources are actually rigid requirements for the survival of life. Without a biological state change, vitality is complete. All living things follow this rule, and none of them are indispensable. This is a corner of the mystery of life, and it is also the principle of nature's constancy.