When did the dinosaurs die and when did the dinosaurs die?

A: The dinosaurs died out between 7,000 and 100 million years ago.

The dinosaurs died out at the end of the Cretaceous period, about 65 million years ago.

Name some of the reasons why scientists speculated that dinosaurs went extinct.

One is that because of the asteroid impact on the earth and the eruption of a supervolcano, the consequence of both is the formation of clouds of dust and sulfuric acid over the earth, the sun's light is blocked, causing the death of plants and the extinction of dinosaurs.

The second theory is that the global temperature has changed dramatically, especially because the abundance of ferns has led to a large increase in oxygen levels in the air, and the air has become colder, while dinosaurs are reptiles and prefer warmer environments.

The third theory is also because of the temperature change, but this time it is warming, that is, it is possible that the mass reproduction of dinosaurs caused the air to warm, and the sex of dinosaurs is determined by the temperature of dinosaur eggs when they hatch, so this leads to the fact that the dinosaurs born are all female, so the dinosaurs have no offspring and die.

The dinosaurs died out 65 million years ago at the end of the Cretaceous period.

It perished about 65 million years ago, during the Late Cretaceous period.

The dinosaurs suddenly disappeared at the end of the Cretaceous period 65 million years ago, becoming a mystery in the history of the evolution of life on Earth, which is still unsolved.

All of the earth's past creatures are recorded in fossils. In the strata of the Mesozoic era, many dinosaur fossils have been found. A large number of bones can be seen in a variety of shapes.

However, in the Cenozoic strata that followed, there were no fossils of non-avian dinosaurs at all, which suggests that non-avian dinosaurs became extinct together during the Mesozoic Era, and that only birds remain today, and most scientists agree that "birds belong to dinosaurs".

There are many types of dinosaurs, and their body shape and habits also vary greatly, with the largest fragile dinosaur being more than 50 meters long, while the smallest hummingbird may be less than 10 centimeters. In terms of eating habits, there are docile herbivores and ferocious meat eaters, as well as omnivorous dinosaurs that eat both meat and vegetables.

Dinosaurs were born in the middle of the Triassic period, which was 100 million years ago, and reached the peak of the dinosaur age in the Jurassic period 100 million years ago, but the Cretaceous dinosaur family went downhill 90 million years ago, and the end of the Cretaceous period was exacerbated by the impact of climate, meteors, and large-scale crustal movements. 65 million to 60 million years ago, in the early Cenozoic, the last group of dinosaurs became extinct in southeastern Asia.

It perished about 65 million years ago. It was the Late Cretaceous period.

The dinosaurs died out 6,500 years ago, in the late Cretaceous period, and no one can figure this out until now.

Dinosaurs died many years ago.

As you know, before humanity the earth.

The owner is a dinosaur. According to scientists' estimates, the dinosaurs died out about 65 million years ago, and it is said that the earth was hit by an extraterrestrial, producing a large amount of dust, obscuring the sky and the sun, similar to what we call a "nuclear winter".

Everything grows on the sun. Nuclear winter has led to the death of a large number of plants on Earth, leaving animals without plants to live on, and a large number of deaths, including dinosaurs.

Seeing this, we may be worried, will humans also suffer the fate of dinosaurs? In fact, the probability that the Earth will encounter an extraterrestrial impact and have catastrophic consequences is very small. The reason for this is that the Earth has a natural barrier in the solar system - Jupiter.

Jupiter is 100 million kilometers away from Earth, it has a mass 318 times that of Earth, and has a strong gravitational pull. Jupiter is able to direct objects from outside the solar system towards itself, thus ensuring the safety of the Earth and increasing the probability of an alien impact to only once every 100 million years. In this way, there is a human civilization on the earth.

So, we don't have to worry about it.

The major mass extinction of dinosaurs occurred 65 million years ago, and a few species did not become extinct until tens of thousands of years later.

Unprecedented mass extinction Dinosaurs have successfully lived on Earth for hundreds of millions of years and have been the masters and powerful rulers of the planet. However, 65 million years ago, at the end of the Cretaceous period, they suddenly disappeared from all parts of the world. Along with the dinosaurs, a large number of other phyla and animals of different ecological conditions were extinct.

On land, crocodiles, lizards, etc. died on a large scale, and higher plants had 1 3 genera extinct. There are also many dead creatures in the ocean, prominent ones such as ammonites, arrowstones, foraminifera, corals, and supermicroorganisms. Famous relatives of dinosaurs, pterodactyls, plesiosaurs, ichthyosaurs, etc., also went with the dinosaurs.

Some scientists counted the number of genera of various phyla at the end of the Cretaceous and the beginning of the Tertiary period, and there were 2868 genera at the end of the Cretaceous period, and only 1502 genera in the early Tertiary period, accounting for 52%, indicating that about half of the organisms were extinct. If we look at the taxonomic units of organisms at the species level, the extinct species of organisms reach 75%, that is to say, about 2 3 organisms are extinct! Fossil data show that the extinction event at the end of the Cretaceous was global and occurred in a short period of time.

Among the extinct animals are those who walk on the ground, those that fly in the sky, and those that swim in the water, and there are not only large animals (such as dinosaurs), but also very small animals. In addition, there are plants. An unprecedented extinction!

It was not only the dinosaurs that disappeared in the extinction event 65 million years ago, but also a large number of other animals and plants, why did reptiles such as crocodiles, lizards, snakes, and turtles survive and continue to thrive until now? And the dinosaurs left only a few fossils? The extinction of dinosaurs is considered one of the top ten scientific mysteries of our time, and it is one of the major unsolved cases in the history of life on Earth.

Since the 70s of the last century, various theories and hypotheses about the great extinction have been promulgated, and there has been an unprecedented controversy. What kind of catastrophe happened that led to such an unprecedented extinction?

1. Dinosaurs died out in the late Cretaceous period, about 65 million years ago.

2. Introduction. 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. The Archaeopteryx fossil found in 1861 is very similar to the Eugenesaurus fossil, except that the Archaeopteryx fossil has traces of feathers, suggesting that the bird may have been descended from dinosaurs.

3. Causes of extinction.

The cause of the extinction of dinosaurs has not yet been determined, and the latest research by scientists believes that when an asteroid collided with the earth hundreds of millions of years ago, it was a period when the dinosaur ecosystem was relatively fragile, and the dinosaurs went extinct after hundreds of millions of years of life.

Simple question, the dinosaurs became extinct in the late Cretaceous period, about 65 million years ago.

This has been debated in the scientific community for a long time. According to the West **April 20**, British scientists have put forward a new speculation, that if the physiological structure of dinosaurs is similar to today's reptiles, then 65 million years ago, due to the great changes in the earth's environment, the sex of dinosaur offspring was greatly affected by temperature, and there was strict.