What extinctions occurred in the first four mass extinction events?

Since the Phanerozoic, there have been five mass extinction events on the earth, the closest one to us was 65 million years ago, an asteroid with a diameter of ten kilometers hit the earth, resulting in the overall extinction of the dinosaurs that ruled the earth for nearly 200 million years, and the remaining part developed and evolved into today's birds, of course, there is also the "fried chicken" on your table, and the other four mass extinctions occurred before the age of the dinosaurs, mainly due to the drastic changes in the earth's environment, some organisms could not adapt to the new environment and died. <>

The first mass extinction event occurred at the end of the Ordovician period, about 100 million years ago, and this extinction event taxonomically led to the extinction of 25% of families, 50% genera, and 85% of species. The main cause of this mass extinction is the fluctuation of temperature, which leads to the fusion and freezing of the ice sheets of the southern continent, the rise and fall of sea levels, and eventually the death of a large number of marine organisms. The more famous ones are sea lilies, trilobites, freshwater jawless fish, etc.; <>

The second mass extinction event occurred in the Late Devonian, this time 100 million years ago, resulting in the extinction of 22% of families, 57% of genera, and 82% of species, and this time the main extinct organisms were also marine organisms. The Devonian was mainly a period of rapid development of vertebrates, especially the emergence of various fishes, so it is also called the "Age of Fishes". This mass extinction event is similar to the first one, mainly due to climate change, the earth's temperature plummets, the oceans freeze, and a large number of marine life die.

The third mass extinction event occurred at the end of the Permian period 100 million years ago, with 53% of families, 84% of genera, and 96% of species extinct during this time. This extinction event was also the most serious and complete of the five, and it almost wiped out all life on Earth. This time the main reason is the drop in sea level and continental drift, which leads to the oxidation of a large amount of organic matter exposure on the seafloor, which consumes a large amount of oxygen in the atmosphere, and increases carbon dioxide, leading to the extinction of a large number of organisms, which is a complete renewal of species.

The fourth mass extinction event occurred at the end of the Triassic period 100 million years ago, with 22% of families, 52% of genera, and 76% of species extinct. This extinction event took a heavy toll on a large number of reptiles.

Some scientists believe that the earth is currently entering the sixth mass extinction period, and this time the protagonist will be humans?

There are dinosaurs, Tyrannosaurus rex, Charizard, and all kinds of fish, and it can be said that those extinctions brought a particularly big kind of trauma. When you think about it, you think it's scary and will do it all over again.

There are so many species of extinct creatures, such as dinosaurs, mammoths, sea lilies, and trilobites, and any extinction event has caused a devastating blow to life.

In fact, many things in the extinction have been left to fend for themselves, for example, sea lilies, trilobites, and other creatures have slowly become extinct, and now they no longer exist.

There are many extinctions, for example, tens of millions of species in the sea. Then there are a lot of them in other places, such as dinosaurs. It's a pity that it's a breed, and it's also perishing.

Earth has had five mass extinction events to date.

1. Ordovician-Silurian extinction event: ended 100 million years ago and killed about 86% of species;

2. Late Devonian extinction event: it ended 100 million years ago and killed about 75% of species;

3. Permian-Triassic extinction event: It ended 100 million years ago and killed about 96% of species;

4. Triassic-Jurassic extinction event: ended 200 million years ago and killed about 80% of species;

5. Cretaceous-Tertiary extinction event: ended 65 million years ago and killed about 76% of species.

How to avoid mass extinctions?

Humans may be able to devise various geoengineering solutions to deal with mass extinction events, such as controlling the Earth's climate through advanced technologies. This sounds amazing, but it also raises some concerns. First, large-scale climate experiments will almost certainly have unintended consequences.

Perhaps while expecting scientists to save humanity (and other species), there are some actions we can take ourselves.

If we want to stop mass extinctions, the first thing we need to do is tackle human-induced climate change. Some scientists believe that the planet may have passed a tipping point from which there is no turning back, but a 2014 report by the United Nations Hail Programme and the World Resources Institute suggests that there is a glimmer of hope.

To keep global warming below 2 degrees Celsius – the criterion for avoiding dangerous climate change, we need to reduce greenhouse gas emissions by 50% by 2050 – a somewhat daunting figure.