Answer
The evolution of life on Earth was influenced by several key events: Organisms began to photosynthesize, the surface cooled and water condensed, volcanoes released carbon dioxide into the atmosphere, and ozone formed to block harmful ultraviolet rays from the Sun. Initially, Earth lacked light and oxygen, leading to the dominance of anaerobic organisms that did not utilize photosynthesis. However, the arrival of green plants and algae marked a turning point, as they harnessed light energy and used carbon dioxide from volcanic activity along with atmospheric water for food production. The formation of the ozone layer further facilitated life by shielding the planet from intense ultraviolet radiation, thus fostering the gradual evolution of living organisms. Therefore, we can summarize that the primary contributors to the evolution of life on Earth include; the onset of photosynthesis by organisms, the cooling of the surface and condensation of water, as well as the protective role of the ozone layer against ultraviolet rays from the sun.
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