A brief introduction to the Permian mass extinction event, which is characterized by the end of the

Trilobites, sea scorpions, and important coral groups have all disappeared. Terrestrial monobowed taxa and many reptile groups also became extinct. The mass extinction caused the main organisms that had occupied the oceans for nearly 300 million years to decay and disappear, giving way to new species, and the most radical renewal of ecosystems, paving the way for the evolution of reptiles such as dinosaurs.

The scientific community generally agrees that this mass extinction was a milestone in the transition of Earth's history from the Paleozoic to the Mesozoic. Nor have other mass extinctions brought about such a major turning point in the evolutionary process of organisms.

The mass extinction was caused by a series of causes, including abrupt climate changes, the expansion of deserts, and volcanic eruptions. Scientists believe that sea level decline and continental drift occurred during the Permian, which caused the worst mass extinctions. At that time, all the continents gathered into a united ancient continent, the rich coastline was drastically reduced, the continental shelf was also reduced, the ecosystem was severely damaged, and many species became extinct because of the loss of living space.

What's more, when the shallow continental shelf is exposed, the organic matter that was previously buried in the seafloor is oxidized, a process that consumes oxygen and releases large amounts of carbon dioxide. It is possible that the amount of oxygen in the atmosphere will decrease as a result, which is very detrimental to animals living on land. As the temperature rises and the sea level rises, many terrestrial organisms have been wiped out, and the ocean has become an oxygen-deficient zone.

The large deposits of organic-rich shale in the strata are proof of this disaster.

The Permian mass extinction put an end to the trilobite, a creature that dominated the oceans for more than 300 million years, one of the worst and most significant in history. Since the vast majority of species are extinct, the earth's species have undergone a radical regeneration, and the history of the earth has entered the Mesozoic era from the Paleozoic Era.

After this reshuffle, after entering the Triassic period, reptiles became the absolute rulers of the earth, and dinosaurs and mammals began to appear. After this major blow, life on Earth is back on its way, evolving towards a more advanced, intelligent, and adaptable form, laying the foundation for the eventual emergence of humanity.

What happened to the Permian mass extinction?

The end-Permian mass extinction is characterized by: （）

a.The third largest eggplant bush in history.

b.The largest in history.

c.It is the most involved in Zheng Yin and biological groups.

d.The impact is the deepest.

Correct answer: BCD