When did the dinosaurs become extinct? As the title suggests, thank you

As we all know, dinosaurs ruled over three geological epochs for a total of 165 million years. However, during the Triassic and early Jurassic periods, dinosaurs still did not become a very powerful species, almost completely dominating the entire evolutionary process of animals. By the end of the Jurassic period, very large sauropods had become the largest creatures ever on Earth.

The end of the Jurassic period was the peak of their domination of the earth, and they far surpassed other creatures of the same period in terms of diversity, intelligence, and size. How did the most legendary species in the history of the earth come to be, and how did it rise? Before the appearance of dinosaurs, lizard-type species had appeared on the earth, and although they were not as large as dinosaurs, they had a certain advantage over other animals at that time.

Paleontologists believe they were the prototypes of the dinosaurs that came later. Lizards appeared in several geological epochs before the Triassic – the Carboniferous period (100 million to 100 million years ago). In that time appeared what is believed to be the world's first reptile :

West Lothian lizard. By the Permian period, a geological epoch before the dinosaurs, reptiles were becoming more diverse and closer in shape to those of the earliest dinosaurs. The Permian was a relatively arid era, and deserts were common.

During the same era, lizards living in groups like the Ichirasaurus and Heterodontosaurus were active in desert oases. During the Late Permian, there were two distinct trends in the evolution of life, both of which had profound implications for the history of the Earth. One of these trends is called dinosaurs, and the other is called mammals.

Just as Earth's evolution was in full swing, an asteroid larger than the meteorite that ended the age of dinosaurs 65 million years ago hit Earth at the end of the Permian period. The impact caused the extinction of most species, but it also served as a catalyst for the emergence of dinosaurs. During the Permian period, the real dinosaurs were about to make their official debut.

One of the earliest dinosaurs to appear, the Black Reisaurus was small and agile, quickly becoming a big winner in the survival game. By the end of the Permian, the Cavinosaurus appeared, the prototype of many carnivorous dinosaurs and birds. Soon in the Jurassic period, the early Jurassic herbivorous dinosaurs began to evolve in size, and the advantage of size could help them escape the pursuit of carnivorous dinosaurs.

Hence the emergence of sauropod dinosaurs; The huge sauropod class pushed dinosaur evolution to its highest peak. Another reason for the emergence of large sauropod dinosaurs is the climate, according to geological records, the late Jurassic period was warm and humid, and dinosaurs could grow to more than 30 meters long. In addition, carnivorous dinosaurs have also become larger, more aggressive and threatening; For example, Allosaurus in North America.

In addition, very special dinosaurs, such as the feathered Chinese dragon bird, began to embark on the path of bird evolution. Under the influence of climate and living conditions, the end of the Jurassic period was the heyday of the Dinosaur Age.

The earth is the only planet with life known to mankind, the earth was born about 4.6 billion years ago, and then the earth began chemical evolution, to the protist era about 100 million years ago, the earth began to show primitive life, bacteria may be the source of the evolution of life on the earth, and the earth began biological evolution.

The evolution of life on Earth has always followed the law from the lower to the higher, from the simple to the complex, and from the marine to the terrestrial. From the perspective of animals, it has experienced the evolution of marine invertebrates, fish, amphibians, creeping animals to mammals. From the plant point of view, its development and evolution experienced the marine algae period, the terrestrial spore plant period, the fern period, the gymnosperm period and the angiosperm period. From the perspective of biological evolution, no species can exist forever, and biological extinction itself is an important part of biological evolution.

No creature can escape extinction, and the higher the creature's rank, the shorter it usually exists. Of course, some species gradually became extinct during evolution, and some species suddenly became extinct due to changes in the environment, such as dinosaurs. Dinosaurs were the overlords of creeping animals, living in the Mesozoic Era, including the Triassic, Jurassic, and Cretaceous periods, and the extinction of dinosaurs was about the end of the Mesozoic Era, about 65 million years ago, when about 45% of all species on Earth were extinct.

Scientists tend to coil around one of two hypotheses that could explain the extinction of the Cretaceous dinosaurs: an extraterrestrial impact, such as an asteroid or comet, or widespread volcanism. In both cases, the sky is clogged with debris that depletes the Earth's solar energy, hinders photosynthesis, and causes destruction up and down the food chain.

Once the dust settles, greenhouse gases locked in the atmosphere will cause temperatures to soar, and rapid climate change will wipe out most of the life that survives prolonged darkness.

Sixty-five million years ago, the last non-avian dinosaur went extinct. The same goes for plesiosaurs in the ocean, as well as pterosaurs in the sky. Plankton, the very foundation of the marine food chain, has been hit hard.

Many brachiopod and sponge families have disappeared. The remaining hard-shelled ammonites are gone. The diversity of sharks has shrunk.

Most of the plants withered. Overall, more than half of the world's species are extinct.

The extinction of the dinosaurs was 65 million years ago. The main reason is that a large asteroid hit the earth, and the large amount of dust caused by the impact caused by the impact caused global climate changes, and a large number of animals and plants died.

The extinction of the dinosaurs occurred about 65 million years ago, and the reason for the extinction was because of changes in the earth's weather.

According to the book, the dinosaurs became extinct 66 million years ago. The main reason for their extinction, according to scientists, is largely due to the impact of planets on the Earth, and then the global volcanic eruption. After all, this is the only possibility that will lead to the extinction of large animals such as dinosaurs, and scientists have indeed found many craters.

How did the dinosaurs go extinct? That's the truth!

How did dinosaurs go extinct?

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How did the dinosaurs go extinct? The letter cover is scattered.