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Anonymous users2024-02-0730 trillion years thousand. Thank you. Satisfied.
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Anonymous users2024-02-06The real causes of the five mass extinctions are many, both natural and human-made. Here are some of the main reasons:
Celestial impacts: Celestial impacts that have the potential to cause mass extinctions in both the third and fifth mass extinctions.
Emergencies: natural disasters such as volcanic eruptions, **, sea level changes, etc.
Climate change: Climate change may lead to the extinction or displacement of species, thereby disrupting the ecological balance.
Destruction of marine ecosystems: Marine ecosystems are being destroyed due to pollution, overfishing, and climate change, leading to the extinction of many species.
Human activities: Human activities are the main drivers of the sixth mass extinction, including deforestation, pollution, climate change, and ecosystem destruction.
The causes of the five mass extinctions are complex and diverse, involving both natural factors and human activities. Protecting ecosystems and species diversity and reducing human impact is key to protecting the planet's ecological environment.
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Anonymous users2024-02-05There were five extinction events in history, namely: Ordovician-Silurian extinction event, Late Devonian extinction event, Permian-Triassic extinction event, Triassic-Jurassic extinction event, and Cretaceous-Tertiary extinction event.
1. Ordovician-Silurian extinction event.
It occurred in the late Ordovician or the transitional period between the Ordovician and the Silurian period, from 100 million to 100 million years ago, and about 27% of the families and 57% of the genera became extinct.
2. Late Devonian extinction events.
From 100 million years ago to 100 million years ago, it was close to the Devonian-Carboniferous transition period. This time it was mainly the extinction of marine life, and the impact on terrestrial life was not significant. About 19% of families and 50% of genera are extinct.
3. Permian-Triassic extinction events.
It occurred during the Permian-Triassic transition 100 million years ago. This is the largest extinction event in known geological history. Many entire orders or suborders of animal phyla were wiped out in this extinction event.
4. Triassic-Jurassic extinction events.
The Triassic-Jurassic transition period 100 million years ago. About 23% of the families and 48% of the genera are extinct. The reasons for this are inconclusive.
5. Cretaceous-Tertiary extinction events.
65 million years ago, about 17% of families, 50% of genera, and 75% of species went extinct. This extinction event was rated as the second of the five mass extinction events, after the Permian-Triassic extinction event. The cause is generally believed to be a meteorite impact on the Yucatan Peninsula in Mexico.
After receiving the task to TS, go to find the monster according to what the heavenly master said.,After finding it, you can start to fight and kill the monster to return to the task.,You can also let the monster go.,And then go to find it.,Although it's time-consuming, it's more experience.,After brushing a round, the captain can get a reward (such as a star god card or something),After brushing two rounds, you will deduct character.,But if you and your friends are warlocks or mages, you can brush them even if they brush.,Brush to the character no.,Then you can team up with a thief.,Thieves can not only get experience and money.,You can also get character., Team up to take a high spirit potion, and then bring a group method BB, absolutely one round of seconds, and you can also brush TS on the 2nd day of your character, and you can upgrade and make money.
synonyms cautious, cautious, trembling, meticulous, walking on thin ice, light-handed, tiptoeing. >>>More
Jokes Beijing, Shanghai can be worse than Guangzhou, Shenzhen!! China's five central cities: Beijing, Shanghai, Tianjin, Chongqing, Guangzhou 1, Beijing Relying on the lofty position of the political center and quite strong economic strength, Beijing is definitely the most influential and the most extensive in the scope of radiation Moreover, Beijing has surpassed Shanghai in many economic fields, such as After 08 years, Beijing's total retail sales of social goods jumped to the first place in the country, and the scale of land finance in 10 years ranked first in the country, and the market value of the financial street in Xicheng District, Beijing was 40 trillion yuan, accounting for Beijing's and the country's. In recent years, Beijing's GDP growth rate has surpassed Shanghai, and the net increase is more than Shanghai, and the gap between the two is gradually narrowing 2 Shanghai is a city with the largest economic aggregate in China for decades, and is the leading city of the Yangtze River Delta, one of the most economically developed regions in China, with a vast economic hinterland, Shanghai Port is the world's largest port, surpassing Singapore to become the world's largest container terminal in 10 years, Shanghai's strength should not be underestimated! >>>More
When it comes to mass extinctions on Earth, we often think of the dinosaur extinction 65 million years ago. But since the birth of the earth, in addition to the mass extinction of dinosaurs, the earth has experienced several mass extinctions.
It should still be the original team, super looking forward to it. I want to see He Lao and Sa Lao. >>>More