The evolution of photosynthetic organisms, such as cyanobacteria and plants, led to a significant increase in the amount of oxygen in the Earth's atmosphere through the process of photosynthesis. This increased oxygen levels transformed the atmosphere from one with very little oxygen to one with abundant oxygen. The presence of oxygen in the atmosphere also led to the formation of the ozone layer, which protected organisms from harmful ultraviolet radiation.
Evidence for this can be found in the geological record, such as the presence of iron formations that were deposited when oxygen levels in the atmosphere began to rise. Additionally, the discovery of stromatolites, which are sedimentary rocks formed by the growth of cyanobacteria, provide further evidence of the evolution of photosynthetic organisms and their impact on the Earth's atmosphere.
The increase in oxygen levels and the formation of the ozone layer also had a profound effect on the biosphere, allowing for the diversification and evolution of more complex organisms that rely on aerobic respiration for survival. This led to the emergence of diverse ecosystems and the complexity of life as we know it today.
And three to five sentences explain how evolution of photosynthesis organisms led to drastic change in the Earth's atmosphere and oceans what evidence do we have that this took place and how did it affect the biosphere
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