Answer: photosynthesis, using sunlight, water, carbon dioxide, or other chemicals
Explanation: Photoautotrophs include green plants, algae, cyanobacteria, etc. In the process of photosynthesis, with the help of special pigments, they absorb light energy and convert it into the energy of chemical bonds of organic substances. The starting material for the synthesis of organic compounds are inorganic substances such as carbon dioxide and water. Thus, photosynthesis is the process of formation of organic substances from carbon dioxide and water, proceeding with the absorption of light energy with the participation of photosynthetic pigments. In plants and algae, photosynthesis takes place in chloroplasts: the light phase is on the membranes of thylakoids and only in the light, the dark phase is in the stroma, regardless of the presence of light. In the light phase, light is absorbed by pigments, photolysis of water, synthesis of ATP and reduction of NADP. One of the products of this phase is oxygen released into the environment.