Autotrophs use carbon dioxide as a carbon source
All things in the world, exist autotrophs, and use carbon dioxide as a carbon source alone. Such organisms can create their own organic substances to form themselves. They use light energy or chemical energy to drive carbon dioxide, through the process of reproduction and biochemistry, to turn into sugars and lipids.

If photosynthetic autotrophs rely on photosynthetic pigments such as chlorophyll, under light, they absorb carbon dioxide and water, and perform photosynthesis. Water is photolyzed to generate oxygen, and carbon dioxide is gradually converted into carbohydrates through the Calvin cycle. Both energy supply and constitution depend on this.

Another example is chemical autotrophs, which obtain energy by oxidizing inorganic substances, and also use carbon dioxide as a carbon source. The energy obtained by oxidizing ammonia, hydrogen sulfide, etc. is used to drive the assimilation of carbon dioxide and make a living.

Autotrophs use carbon dioxide as a carbon source and are crucial to the ecological cycle. The organic matter synthesized by them provides food and energy for heterotrophic organisms, builds ecological cornerstones, and maintains the vitality of all things.