Why was cyanobacteria important to evolution and great ecological changes?

Cyanobacteria are the major force of the Great Oxygenation Event around 2.35 billion years ago. The organisms that evolved photosynthesis changed the composition of the atmosphere to mainly oxygen. This changed the dynamic of life on earth by allowing organisms to also exist on land. This is because it was possible for ozone to form and reduce the lethal UV rays from the sun reaching the earth's surface to destroy genetic material.

answer: i don't know

explanation:

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