How did the dinosaurs go extinct, please thank you

Nonsense, the dinosaurs are extinct, and they are all over the streets.

How did dinosaurs go extinct?

How did dinosaurs go extinct?

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 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.

Multiple extinctions on Earth are inevitable in the evolution of the solar system's environment. In the long process of evolution, the solar system has given birth to life, and at the same time, it has also continuously eliminated some species that cannot adapt to the environmental changes of the solar system. To this day, we still haven't been sure if there is life on other planets in the solar system besides Earth.

The extinction of the dinosaurs is indeed a natural mystery of great interest to mankind. That's because dinosaurs were once dominant on Earth, and their extinction is a sign of a huge change in the Earth's environment. Let's analyze the basic conditions for biological extinction:

1) Changes in the temperature environment (2) Changes in the radiation environment (3) Changes in the gravitational environment (4) Disruption of the food chain The changes in (1), (2), and (3) may lead to the disruption of the food chain. Therefore, species extinction is usually a tendency for parts of the food chain to disappear. Those animals that crossed the food chain were able to survive and evolve into species that were more adapted to their environment at the time.

First of all, the era when dinosaurs lived, the earth's climate was hot. As the climate initially cooled, a large number of organisms that were not adapted to the cold became extinct. Dinosaurs were most likely to become extinct due to temperature changes.

However, because the time scale of extinction is too short, it is hypothesized that an asteroid hitting the Earth will also cause the Earth's climate to cool suddenly, and it will not be able to return to the state before the impact. However, it is not excluded that the Earth's climate will change a lot due to changes in the brightness of the sun. In fact, in the process of giving birth to life on Earth, it must have been after the massive impact of an asteroid on Earth.

Otherwise, the earth's environment will not be very stable, and the route of life evolution will be difficult to determine due to the drastic changes in the environment. In the age of the dinosaurs, it was certainly not a regular occurrence for asteroids to hit the Earth. At that time, the probability of an unexpected event on the Sun was higher than that of an asteroid impact on the Earth.

Solar emergencies will cause not only changes in the temperature environment, but also sudden changes in the Earth's radiation environment, so that a large number of species will inevitably be eliminated. Biological experiments have shown that changes in the radiation environment can cause rapid extinction or mutation of species. Gravitational environmental changes are related to the density distribution of matter in the solar system.

The changes in the gravitational environment of the solar system as a whole may be related to the position of the Sun in the Milky Way. The evolutionary timescale in this area is very long and difficult to determine. Anyone can put forward the hypothesis of the extinction of the dinosaurs.

But it's the hypothesis that tests the most important thing. The only way to test the hypothesis is to obtain concrete evidence through the archaeology of the solar system (including the Earth). Therefore, it is easy to come up with a hypothesis, but the search for archaeological evidence is difficult and exciting.

Exploring the mystery of the extinction of the dinosaurs is essentially exploring the mystery of the evolution of the solar system. This is by no means an isolated incident.

How did dinosaurs go extinct?