Every biologist knows how important the Great Oxygenation Event was. It took the first photosynthetic organisms hundreds of millions of years to enrich Earth’s atmosphere with oxygen, leading to complex life like us. But before complex,…

Every biologist knows how important the Great Oxygenation Event was. It took the first photosynthetic organisms hundreds of millions of years to enrich Earth’s atmosphere with oxygen, leading to complex life like us. But before complex,…