Great Oxidation Event Was A Death Sentence To Many

So cyanobacteria basically invented photosynthesis around 2.4 billion years ago and thought they were doing everyone a favor by pumping out oxygen. Plot twist: oxygen was literally poison to most of the anaerobic organisms chilling on Earth at the time. It's like showing up to a party and replacing all the drinks with bleach.

The Great Oxidation Event caused one of the most catastrophic mass extinctions in Earth's history. All those microbes that had been vibing in an oxygen-free world for billions of years suddenly found themselves in a corrosive hellscape. Oxygen is super reactive and tears apart cellular machinery if you're not equipped to handle it. Talk about friendly fire from the microbial world.

The irony? We oxygen-breathing creatures owe our entire existence to this toxic apocalypse. Without cyanobacteria's "oopsie" moment, complex life as we know it wouldn't exist. Thanks for the genocide, little blue-green buddies!