There was a creature that changed the whole world. It created the first great extinction in the history of Earth, paving the way for complex life later. How?
By introducing the first free oxygen molecules into the air, they do this in the form of unicellular life.They are bacteria Lam.
This story of this simple, non-organism-free organism is a key chapter in life's history on Earth.
The atmosphere is not always rich in oxygen to breathe today. 3.5 billion years ago, the atmosphere was almost like nitrogen gas, CO 2 and methane (CH 4 ). Most oxygen exists as molecules like water instead of floating in the air.
