What was the significance of the appearance of the process of photosynthesis for the development of life on Earth?

1) Formation of the ozone layer, which protects against hard UV radiation, which made it possible for organisms to land on land
2) Synthesis of organic substances from inorganic ari using the energy of the sun in the process of photosynthesis provided nutrition for heterotrophs
3) The accumulation of molecular oxygen in the atmosphere contributed to the emergence of aerobic organisms

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