How AI uncovered 3 billion years of bacterial evolution across 1 trillion species
There are roughly a trillion species of microorganisms on Earth – the vast majority of which are bacteria. Bacteria consist of a single cell. They do not have bones and are not like big animals that leave clear signs in the geological record, which thankful palaeontologists can study many millions of years later. This has made it very hard for scientists to establish a timeline of their early evolution. But with the help of machine learning, we have been able to fill in many of the details. Our new research, published today in Science, also reveals some bacteria developed the ability to use oxygen long before Earth became saturated with it roughly 2.4 billion years ago. A monumental event in Earth’s history About 4.5 billion years ago, the Moon formed. Violently. A Mars-size object collided with Earth, turning its surface into molten rock. If life existed before this cataclysm, it was probably destroyed. After that, the current ancestors of all living beings appeared: single-cell...