When did the dinosaurs become extinct?! Why did the 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.

65 million years ago, the dinosaurs became extinct during this period due to the impact of alien celestial bodies on the earth, causing volcanoes to erupt all over the earth,** causing a sharp decrease in the oxygen content in the air.

How did dinosaurs go extinct?

There is no way to know, but there are a number of hypotheses:

1. The hypothesis that an asteroid hits the earth: an asteroid hits the earth, causing a large amount of dust to obscure the earth's atmosphere, causing animals to freeze or starve to death at that time. (the more common way of saying it is now).

2. Volcanic eruption hypothesis: At the end of the Cretaceous period, there was a volcanic eruption, and the violent volcanic activity sprayed a large amount of volcanic ash, sulfate, and carbon dioxide into the atmosphere, blocking the sunlight, and the climate was cold, which caused the dinosaurs to perish.

3. Climate change hypothesis: the Jurassic humid and hot, almost perennial temperature remained unchanged until the Cretaceous global natural environment deteriorated, the climate seasonality was obvious, the temperature difference between day and night became larger, and the warm and humid climate zone gradually shrank, leading to the extinction of the dinosaurs.

4. Food poisoning or scarcity hypothesis: In the late Cretaceous period, plants were replaced, so that dinosaurs could not eliminate plant toxins in the process of changing food, resulting in their death. At the same time, it is not excluded that the dinosaur population is less fertile due to lack of food to reduce the pressure on the population.

5. Ocean change hypothesis: Since the middle of the Cretaceous period, the separation and drift of continental plates have accelerated significantly, the ocean circulation has become more complex, and the earth's crustal movement has intensified, causing the sea to retreat, causing the earth's surface temperature to rise rapidly, leading to the extinction of all dinosaurs.

How did dinosaurs go extinct?

One day 65 million years ago.

It became extinct 65 million years ago, in the late Cretaceous.

There are legends of acid rain poisoning, meteorite impacts, climate change, superbug outbreaks, and cosmic planets hitting the Earth.

Volcanic eruptions, floods, ** Hey, I don't know.

How did the dinosaur become extinct and obscure?

How did the dinosaur mountain world extinguish the source of the tease split limbs?

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