When did the dinosaurs disappear, why did the dinosaurs disappear

Scientists accurately determined that the dinosaurs became extinct 65.95 million years ago The extinction age of the dinosaurs was a transitional period between the Cretaceous and Tertiary periods, which fluctuated up and down for about 40,000 years 65.95 million years ago. The date of the extinction of the dinosaurs has been determined much more accurately than before.

You know: no one really knows when the dinosaurs died.

There are many theories, some say that it was because a comet hit the earth, causing a volcanic eruption, and the dinosaurs could not escape and died, some say that it was because of changes in the environment, the number of trees decreased, the herbivorous dinosaurs died of lack of food, and the carnivorous dinosaurs then died.

In general, it is because dinosaurs do not adapt to changes in the environment. It is a basic law of the biological world that an organism will die if it cannot adapt to the environment.

In the Late Cretaceous period, about 65 million years ago.

About 65 million years ago:

There are many factors that contributed to the extinction of dinosaurs, and the scientific community has not yet reached a conclusion, but one of the most fundamental reasons is that dinosaurs could not adapt to the environmental (climate) changes at that time, so they died out.

Late Cretaceous, about 65 million years ago.

The dinosaurs became extinct 65 million years ago.

Dinosaurs were diverse dominant terrestrial vertebrates that appeared in the Mesozoic. The word "dinosaur" is a translation of the English dinosauria or "terrifying lizard" by biologists, not the "dragon" in traditional Chinese culture. Dinosaurs dominated the world's terrestrial ecosystems for more than 160 million years.

Dinosaurs first appeared in the Late Triassic 230 million years ago and emerged from the mass extinction, which occurred at the end of the Cretaceous period about 65 million years ago, during the Late Cretaceous period.

Dinosaurs emerged during the Mesozoic era.

Dinosaurs were the dominant terrestrial vertebrates in the Mesozoic, especially in the Jurassic and Cretaceous. During the Jurassic and Cretaceous periods, when dinosaurs were dominant, almost all land animals larger than 1 meter in length were dinosaurs, and other animals of the era were limited by their size development and ecological niche. Mammals, for example, were mostly close to modern rodents in size, no larger than the size of cats, carnivorous, and subsistent on small animals [9].

One exception is the Cretaceous giant reptile (Repenomamus giganticus), which weighs 12 to 14 kilograms and is known to feed on small dinosaurs such as juvenile Psittacosaurus.

Dinosaurs (including birds) were a group of land-dwelling master reptiles, with limbs erect under the body rather than spreading out on either side, and they appeared in the Late Triassic Carney Order, where various dinosaurs rapidly evolved different specialized features, developed different body sizes, occupied different ecological niches, and continued to survive until the Late Cretaceous Maastricht.

There are many types of reptiles that lived in the same period as dinosaurs, such as: ichthyosauridae, cangsauridae, plesiosauridae, pterosaurs, and discosaurs, and many people often classify them as dinosaurs, but they do not belong to dinosaurs in scientific classification. Ichthyosaurs, cantosaurs, and plesiosaurs are all marine reptiles that do not live on land and do not belong to the main dragon class; Pterodactyls belong to the main dragon class and evolved separately from the dinosaurs during the Triassic period, but they were not terrestrial animals

Coilosaurs lived in the Permian and are closely related to mammals.

It is known that dinosaurs ruled 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 advent 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 survival games. By the end of the Permian, the Cavinosaurus appeared, which was 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.

Dinosaurs were a group of animals that lived between 235 million and 65 million years ago and were able to walk upright with hind limbs supporting their bodies, and dominated the world's terrestrial ecosystems for more than 160 million years. Most of the dinosaurs have gone extinct, but the descendants of the dinosaurs, the birds, have survived and survived to this day. Dinosaurs first appeared in the late Triassic period, about 235 million years ago, and died out during the late Cretaceous mass extinction event that occurred in the late Cretaceous period, about 6,500 years ago.

When it came to the reptile period, dinosaurs began to appear. The extinction of dinosaurs was due to a variety of reasons. But the current environment is no longer living with dinosaurs, and it may be difficult for dinosaurs to reappear.

Dinosaurs and mammalian arbodons both appeared in the Late Triassic, and those mammals of the Zygosaurus foradodae canodont suborder evolved into true mammals in the Jurassic, and the late Jurassic mammals evolved independently from the original protozoan subclass into two true viviparous mammals of the true beast subclass and the post-mammalian subclass, at the same time, the dinosaurs of the genus Archaeopterosaurus have been on the road of evolution to birds, until the end of the Cretaceous period, the dinosaurs that did not evolve into birds were all wiped out, And the mammals have regained the throne of their ancestors.

DinosaursIn history, humans have discovered dinosaur fossils for a long time. It's just that due to the limited level of knowledge at that time, it was not possible to give a correct interpretation of these fossils. According to legend, as early as more than 1,700 years ago in China, dinosaur fossils were found in Wucheng County, Sichuan Province (then known as Shu County of Bashu).

However, people at the time did not know that they were the remains of dinosaurs, but thought they were bones left behind by legendary dragons. Long before the Mantels discovered the avianthosaurus (the first dinosaur to be named), Europeans knew that there were many strangely shaped and huge animal bones buried in the ground. However, at the time, people did not know their exact attribution, so they were always mistaken for "the remains of giants".