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4.5 BYBP: The sun formed from a big cloud of gas and dust. The cloud was dark and cold, and its gravity caused it to fall together.
4.5 BYPB: The earth is formed.
The oxygen catastrophe was when dioxide made its appearance in the Earth's atmosphere. It killed off many bacteria in the ocean, and it was created by cyanobacteria.
Iron atoms and these new Oxygen atoms (created by cyanobacteria) combined and created rust on the bottom of the ocean floor.
Plants are discovered to be photosynthetic, which are caused by chloroplasts. Scientists realize chloroplasts and cyanobacteria are very similar.
Scientists discover that chloroplasts are cyanobacteria that have adapted to living in this certain plant. This is called endosymbiosis; when one living thing becomes incorporated with another. Humans would be dead without this cyanobacteria.
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