What is the impact of photosynthetic organisms on inanimate nature?

What is the impact of photosynthetic organisms on inanimate nature? What effect did photosynthetic organisms have on other organisms?

Photosynthetic organisms have a great impact on living and inanimate nature. Using carbon dioxide and water, they release oxygen as a by-product of the reaction. This maintains a constant air composition. This is approximately 78% nitrogen, 21% oxygen and 0.032% carbon dioxide. This has a direct effect on all living organisms. It is to this composition of air that all animals are adapted. If the amount of CO2 is about 1%, then the person will get severe poisoning. Moreover, if there is a couple of percent more oxygen in the air, it will have a bad effect on our body.