what happened 2 billion years ago ?

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https://www.cnn.com/2019/09/04/us/life-on-earth-wiped-out-2-billion-years-scn-trnd/index.html

https://www.cnn.com/2019/09/04/us/life-on-earth-wiped-out-2-billion-years-scn-trnd/index.html
Almost all life on Earth was wiped out 2 billion years ago | CNN
4 sept. 2019CNN — The most catastrophic wipe-out on Earth didn’t happen to the dinosaurs. A new study found extreme changes in the atmosphere killed almost 100% of life on Earth about 2 billion years…

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life
Timeline of the evolution of life on Earth | New Scientist
Massive bodies continue to strike the Earth, at a declining rate, for the next 1.5 billion years, ending about 3 billion years ago. The impacts reshape the planet surface and may help…

https://www.ecowatch.com / mass-extinction-billions-years-ago-2640190509.html

https://www.ecowatch.com / mass-extinction-billions-years-ago-2640190509.html
Mass Extinction Event 2 Billion Years Ago Killed 99% of Life … – EcoWatch
Malcolm Hodgskiss Some two billion years ago, a significant decline of once-abundant oxygen killed as much as 99 percent of all life on Earth in a mass extinction event larger than the one responsible for the dinosaur die-off.

https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life

https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life
Timeline of the evolutionary history of life – Wikipedia
The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet’s obligate anaerobes. Researchers have identified five other major extinction events in Earth’s history, with estimated losses below: [11] End Ordovician: 440 million years ago, 86% of all species lost, including graptolites

https://en.wikipedia.org/wiki/Great_Oxidation_Event

https://en.wikipedia.org/wiki/Great_Oxidation_Event
Great Oxidation Event – Wikipedia
Great Oxidation Event O 2 build-up in the Earth’s atmosphere. Red and green lines represent the range of the estimates while time is measured in billions of years ago (Ga). Stage 1 (3.85-2.45 Ga): Practically no O 2 in the atmosphere. The oceans were also largely anoxic – with the possible exception of O 2 in the shallow oceans.

https://www.livescience.com/earth-early-oxygen-fluctuated.html

https://www.livescience.com/earth-early-oxygen-fluctuated.html
Earth nearly lost all its oxygen 2.3 billion years ago
Oxygen rose again 2.32 billion years ago — the point at which scientists previously thought the rise was permanent. But in the younger rocks, Bekker and his colleagues again detected a drop…

https://en.wikipedia.org/wiki/History_of_Earth

https://en.wikipedia.org/wiki/History_of_Earth
History of Earth – Wikipedia
1 Eons 2 Geologic time scale 3 Solar System formation 4 Hadean and Archean Eons Toggle Hadean and Archean Eons subsection 4.1 Formation of the Moon 4.2 First continents 4.3 Oceans and atmosphere 4.4 Origin of life 4.4.1 Replication first: RNA world 4.4.2 Metabolism first: iron-sulfur world 4.4.3 Membranes first: Lipid world 4.4.4 The clay theory

https://www.cnet.com/science/mass-extinction-2-billion-years-ago-reportedly-killed-99-percent-of-life-on-earth

https://www.cnet.com/science/mass-extinction-2-billion-years-ago-reportedly-killed-99-percent-of-life-on-earth
Mass extinction 2 billion years ago reportedly killed 99% of … – CNET
A mass extinction occurred around 2 billion years ago, wiping out up to 99.5% of life on Earth, scientists have reportedly said.It killed off more of Earth’s biosphere than the event causing the …

https://www.britannica.com/science/life/Evolution-and-the-history-of-life-on-Earth

https://www.britannica.com/science/life/Evolution-and-the-history-of-life-on-Earth
Life – Evolution, History, Earth | Britannica
Darwin’s principle of evolution is summarized by the following facts. All life tends to increase: more organisms are conceived, born, hatched, germinated from seed, sprouted from spores, or produced by cell division (or other means) than can possibly survive.

https://www.britannica.com/science/Archean-Eon

https://www.britannica.com/science/Archean-Eon
Archean Eon | Atmosphere, Timeline, and Facts | Britannica
The Archean Eon began about 4 billion years ago with the formation of Earth’s crust and extended to the start of the Proterozoic Eon 2.5 billion years ago; the latter is the second formal division of Precambrian time. lesoutrali bot