What role did the emergence of photosynthetic plants play in the evolution of the organic world?

Thanks to the appearance of plants carrying out photosynthesis, a gradual saturation of the earth’s atmosphere took place and a large-scale accumulation of organic matter began, which was a kind of canned energy received from the Sun. And as a result of evolutionary development, new forms of organisms began to appear, a variety of animals, whose vital activity is based on the use of oxygen and organic matter accumulated during the growth and development of plants.