How did the emergence of photosynthetic organisms affect the further evolution of life on Earth?

1). In the process of photosynthesis, oxygen is a by-product, therefore, the appearance of photosynthetic organisms caused the accumulation of oxygen in the atmosphere, which led to the appearance of aerobic respiration;
2). With the advent of oxygen, an ozone screen began to form, which will reduce the flow of solar ultraviolet radiation, which allowed organisms to master the land;
3). Photosynthetic plants provide ready-made organic matter for heterotrophs.