Question

In 3 sentences explain evolution of photosynthesis organisms, lead to a drastic change in atmosphere and oceans. What evidence do we have this support this event took place how did it affect the biosphere?

Answer 1

The evolution of photosynthesis organisms, such as cyanobacteria, led to an increase in atmospheric oxygen levels as a byproduct of photosynthesis. This drastic change in the atmosphere around 2.5 billion years ago, known as the Great Oxidation Event, caused a shift in the composition of gases on Earth. Evidence for this event includes the presence of banded iron formations in ancient sedimentary rocks, which formed in oxygen-poor oceans before the Great Oxidation Event. This increase in atmospheric oxygen allowed for the development of more complex life forms, leading to the diversification of the biosphere.