How did dinosaurs go extinct? As the title suggests, thank you

About 200 million years ago, the Earth was littered with large swamps. Deep valleys and hillsides are covered with dense forests. That's the footprints of dinosaurs all over the world.

But dinosaurs have lived on Earth for more than 100 million years, about 65 million years ago, when they suddenly and mysteriously disappeared. What is the reason for this? Claim 1:

Died in the Great Flood. Japanese physicist Takahashi believes that in addition to the nine planets in the solar system, there was also a body of ice water with a life span of 1 million years, which periodically approached the earth and caused major floods. The great upheaval of the earth caused the sudden death of animals.

Claim 2: Died from cosmic rays. Some people believe that a nova or supernova not far from Earth** caused a surge in cosmic rays, causing the death of dinosaurs.

Claim 3: Died from a colder climate. The American Burke speculated that the dinosaurs were warm-blooded animals, not cold-blooded reptiles, and one of the evidences was that the dinosaurs walked at speeds of up to 80 kilometers per hour, which the reptilian metabolic mechanisms could not bear.

Because the dinosaur had neither hair nor an organ to regulate temperature, once the earth cooled, it could not adapt to this climate change and had to become extinct. Claim 4: Died of mammals.

It is believed that the first mammals appeared during the Mesozoic era. These gluttonous little ones may be feasting on dinosaur eggs. Paleontologists have also found dinosaur eggs that have been partially eaten by small animals.

Claim 5: Died from angiosperms. A 5-ton dinosaur eats 200 kilograms of food every day.

By the end of the Mesozoic Era, angiosperms developed rapidly, and the toxic substances in the plant were harmful to most animals. In this way, the accumulation of toxins in the dinosaur's body caused it to produce physiological changes that led to death. Some scholars have tried to confirm this by judging the dinosaur's disease, death posture and toxic chemicals on the eggshells based on the remains.

Which statement is correct remains to be further determined by scientists. However, many scholars believe that dinosaurs were not all extinct, and that there are still living dinosaurs on Earth to this day. For example, in the Little Sunda Islands in India, there is a small island called Komodo, which still lives on the island and a dinosaur still lives on the island.

It resembles a lizard in appearance, with four short, stout legs beneath its massive cylindrical body. Its skull is as soft as a snake's, and its head and neck can be visibly deformed, allowing it to swallow large chunks of meat. It eats an astonishing amount of meat, swallowing an average of 3 kilograms of meat in one minute.

It has an extremely sensitive sense of smell and can find prey up to 8 kilometers away. It has no sweat glands and cannot effectively control its own body temperature, and if its body temperature exceeds Celsius, it will die from excessive heat. Was this animal a dinosaur?

The features listed in the report are tendentious, are there any characteristics that are different from dinosaurs? These still require detailed information and accurate proof.

Dinosaurs....It is a reptile that appeared 245 million years ago and flourished in the Mesozoic Era 65 million years ago. The sudden disappearance of dinosaurs at a certain time has become a mystery in the history of the evolution of life on Earth, a mystery that no one has solved to this day. 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 dinosaur fossils at all.

It is inferred that the dinosaurs became extinct together during the Mesozoic Era. The real reason for the extinction of dinosaurs has been widely debated since ancient times, but there is no definite argument, so it is still an unsolved mystery so far, and only some of the more well-known theories are summarized as follows: a.

Meteorite collision said. Two. Comet collision said

Three. The orogeny says: Four.

Climate Change Says: V. Volcano Breath Says:

Six. The ebb of the ocean says: Seven.

The warm-blooded animal said: Eight. Cannibalism said:

Nine. The Doctrine of Oppression: X.

The mammalian prisoner said:

Remember.

I think it was because the asteroid fell and killed the dinosaurs.

How did dinosaurs become extinct?

There are many reasons for the extinction of dinosaurs, but two are more convincing.

1. It may be due to a volcanic eruption, and then **.

2. It may be caused by a meteorite impact. Meteorites hit the earth and produce a large amount of gas that accumulates in the atmosphere, so that sunlight cannot reach the earth, and plants cannot carry out light and function and die. Then the plant-feeding animals (including the herbivorous dinosaurs) died, and the carnivorous dinosaurs died without food.

How did the dinosaurs go extinct? That's the truth!

How did dinosaurs go extinct?

No, it should be a change in the environment, and the dinosaurs couldn't adapt to the new environment and became extinct.

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?

The extinction of the dinosaurs is a very worthwhile question. I think the results of the research of Chinese scientists are the most convincing, as most of the claims are: dinosaurs died in a meteorite impact, but they were not extinct, and their extinction took a long time after that. It was a time when you could imagine that the conditions were very poor, half of the earth was a harsh flame, and the other half was an eternal winter night that saw no day.

The dinosaurs that survived in this environment are still struggling to live, but a very terrible disease is gradually eroding this declining race, as we all know, dinosaurs are egg-born animals, that disease is that the eggshells of dinosaurs become very fragile, basically the dinosaurs can not hatch into small dinosaurs, in a long process dinosaurs gradually died out under the influence of this lesion, until today we see only dinosaur fossils. I think this statement is very powerful, I believe that no matter what the environment has become, there are still some animals that survived at that time, and if the impact of meteorites completely destroyed the life of the earth, then the current human beings should not exist. ^_

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?

Asteroids hitting the Earth, the arrival of the Earth's glacial age, and food shortages may all be the reasons for the extinction of the dinosaurs.