When did dinosaurs appear What period did dinosaurs appear

During the Triassic period, there were all kinds of reptiles – runners, swimmers, burrowers, and even flying reptiles (as well as the first mammals, which were small, mouse-like animals). Among the reptiles, there are crocodile-like animals, each with a tail and powerful hind limbs, which scientists call alveolars. When other types of reptiles die out, they become numerous, and their offspring – animals that evolved from them – adopt a multitude of lifestyles.

In this way, they develop into a variety of body shapes to suit their habits. There was a group of alveolars that began to walk on their strong hind limbs, raising their long tails behind their backs to keep their bodies balanced. These animals became the first dinosaurs.

Late Permian.

In the late Permian, there were two distinct trends in the evolution of life, and both had a profound impact on the history of the Earth. One of these trends is called dinosaurs, and the other is called mammals.

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.

About 200 million years ago, in the middle and late Triassic period.

Triassic bar! It is a period before the Jurassic period.

Dinosaurs appeared 215 million years ago, and dinosaurs became extinct 65 million years ago.

Now it appears, because there were no humans before, let alone a definition of dinosaurs, who knows what "dinosaurs" are? How can something that is not defined come about?

There are no dinosaurs anymore and it won't appear.

When were dinosaurs born?

Dinosaurs appeared during the Triassic period.

During the Triassic, vertebrates were further developed. In the late Triassic, there are many species of sauropods and ornithischians, dinosaurs are already a diverse group, occupying an important position in the ecosystem Therefore, the Triassic is also known as "the dawn before the dinosaur generation".

According to the analysis of earth experts, continental drift can cause a series of environmental changes, which in turn can cause climate change. When the southern continents are separated, the newly formed ocean surface is also raised. As a result, all the seas are high and the sea expands to the land, and most of the land is covered by shallow seas.

The oceans have a huge impact on climate change, and when the ancient continents were not separated, the temperature on the earth was almost the same from the equator to the poles, and the temperature difference was not much different. However, in the late Cretaceous, the sea retreated, the climate changed, and the polar regions became colder, while in other regions, it became a temperate climate alternating between cold and heat, which provided external conditions for the extinction of dinosaurs adapted to the warm climate. The dinosaurs could not adapt to this change and slowly became extinct.

Dinosaurs appeared about 235 million years ago. Dinosaurs refer to the most recent common ancestors of Triceratops, modern birds, and Diplodocus and all of their descendants. Dinosaurs can be divided into avian and non-avian dinosaurs, of which non-avian dinosaurs lived only in the Mesozoic era (Triassic, Jurassic and Cretaceous) and were all extinct 65 million years ago.

Some non-ornithischian dinosaurs had sturdy limbs, long tails, and large bodies, and they lived mainly in woodlands or open areas on lakeshore plains (or coastal plains).

Non-avian dinosaurs have lived on Earth for hundreds of millions of years, and a branch of theropod dinosaurs diverged into birds. At the end of the Cretaceous period, non-avian dinosaurs suddenly disappeared from all parts of the world.