Autotrophs use inorganic carbon such as carbon dioxide as a carbon source, and can convert it into organic carbon compounds through their own metabolism to maintain life activities.

In ancient times, there were organisms that did not rely on other things for carbon, but only used inorganic carbon between heaven and earth, such as carbon dioxide, as a source. Their bodies have their own wonderful way to use light energy or chemical energy to convert this inorganic carbon into organic things such as sugar and fat. These organisms either live on the banks of deep-sea hot springs and use chemical energy to make a living; or in the vast world, they use light energy to photosynthesize.

Those who are autotrophic with light energy have delicate pigments between the leaves, which can capture light as energy. They use water and carbon dioxide as materials to produce organic carbides through complex biochemical processes, and at the same time release oxygen to nourish all things in the world. And those who are autotrophic, in a dark and deep place, use the energy of oxidizing inorganic substances to obtain energy, and also turn inorganic carbon sources into organic matter required for life.

The utilization of carbon sources by autotrophs is like a delicate cycle between heaven and earth. It starts with inorganic carbon to breed organic life chapters. In the ecological network, it plays the cornerstone role, paving the way for the survival of thousands of species.