Why did dinosaurs go extinct? Why did the dinosaurs go extinct?

About 200 million years ago, huge dinosaurs appeared, and they ruled the earth for 140 million years before they went extinct. There are many varieties of dinosaurs, from huge and clumsy herbivores such as long-arm dragons, to rat-like reptiles running quickly, to flying pterosaurs and terrifying Tyrannosaurus rex.

The reason why dinosaurs went from domination to extinction from the earth remains a mystery in a strictly scientific sense. Throughout evolutionary history, many new species have emerged, and at the same time, many plants and animals have been wiped out and extinct, so that today's millions of species represent only a small fraction of all the organisms that have ever lived. Then, species extinction is not always gradual.

There have been mass extinctions in the history of life, when a large number of species went extinct in a short period of time (in a geological sense). One of these mass extinctions occurred at the end of the Permian, when an estimated 16 marine species went extinct. And the most famous extinction occurred at the end of the Cretaceous period, when dinosaurs and other species disappeared.

The most likely explanation for the extinction of the dinosaurs is that the Earth has changed dramatically and has become colder. Some believe that this is due to the effects of a huge meteorite, which throws dust and fog into the atmosphere. Dinosaurs lacked the complex systems that mammals possess to maintain their body temperature and may not have been able to withstand this change and thus disappeared from the earth.

Because the Earth's environment is constantly changing.

The causes of the extinction of the dinosaurs include climate change, ocean ebb tides, volcanic eruptions, orogeny, mammalian evolution, etc.

1. Climate change theory.

As tectonic plates move, ocean currents change, causing dramatic changes in the climate. The cold and dry climate killed plants, and the dinosaurs died out due to lack of food.

2. The low tide of the ocean is said.

When the ocean is low tide and the land borders each other, organisms come into contact with each other, resulting in the extinction of certain types of organisms. Kangaroos, for example, can survive on island continents such as Oceania, but they become extinct when they encounter other animals on the South American continent. In addition to this relationship between eating and being eaten, there is also the problem of infection and transmission of diseases and parasites.

3. Volcanic eruption theory.

Because of the eruption of volcanoes, a large amount of carbon dioxide is ejected, causing the greenhouse effect of the earth to be intense, causing the death of plants. In addition, volcanic eruptions caused a large amount of salt to be released, the ozone layer was broken, and harmful ultraviolet rays irradiated the earth's surface, causing the dinosaurs to die.

4. The orogeny said.

The orogeny that took place at the end of the Cretaceous period dried up the swamps, and many of the dinosaurs that called the swamps home were no longer able to live. Because of climate change, plants also changed, and herbivorous dinosaurs were unable to adapt to the new food and became extinct.

5. The theory of lactation evolution (stealing food).

In the second half of the Mesozoic Era, there were already mammalian ancestors alive. According to fossil records, mammals were very small and limited in number, and it was not until the late Cretaceous period that their numbers began to increase rapidly. It is speculated that they are omnivorous and eat insects and other staple foods, and these small mammals continue to eat dinosaur eggs after discovering them, which eventually leads to the fertility crisis of dinosaurs and the extinction of dinosaurs.

Reason 1, dinosaurs are cold-blooded animals, the biggest disadvantage of cold-blooded animals is that once the weather becomes cold, it will be inconvenient to move, and then it will become a dish of hot-blooded animals, which is why crocodiles only survive in Africa.

Reason 2, why did only crocodiles survive, but other land dinosaurs perished? The reason is also very simple, crocodiles are in the water, the water is more suitable for cold-blooded animals to survive, the feathers and fur of hot-blooded animals do not work at all in the water, only a few hot-blooded animals have the ability to survive in the water, but for the relatively warm water in Africa, the crocodile's mobility is not weak. But how many dinosaurs don't have this ability, reason 3 As soon as the weather gets cold, small dinosaurs can also dig a hole to hibernate, so lizards like lizards that can dig holes to hibernate also survived, but large dinosaurs can't, hibernate in the open air, and can't sleep before falling asleep.

Therefore, the extinction of the dinosaurs is inevitable.

The living environment has changed dramatically.

There is some debate about the reasons for the extinction of the dinosaurs, but the main theories are as follows:

Mass extinction event: The most well-known theory is a mass extinction event that occurred about 65 million years ago, known as the Cretaceous-Paleogene extinction event. This event may be caused by a huge meteorite hitting the Earth, or a combination of factors such as volcanic eruptions and liquid hail climate change.

The event led to the disappearance of about 75% of all species on Earth, including most dinosaurs.

Environmental change: Another mainstream theory is that the extinction of dinosaurs was related to rapid changes in the environment. At the end of the Cretaceous period, the Earth experienced drastic changes in climate and oceans.

This could include factors such as global warming, rising sea levels, and changes in ocean quality, which may have contributed to the destruction of dinosaur habitats and food chains.

Competition and evolution: There is also a theory that the extinction of dinosaurs was related to the competition and evolution of other species. At the end of the Cretaceous, competitors such as mammals and birds began to develop rapidly, and they occupied more ecological niches in the ecosystem.

Dinosaurs may not have been able to adapt to this competition and eventually become obsolete.

In the Cretaceous period, 65 million years ago, a meteorite with a diameter of 60 kilometers went out of orbit and crashed into the Earth's Yucatan Peninsula in Mexico at a speed of 30 feet per hour, with a force of up to one billion Hiroshima atomic bombs! Then the meteorite cracked into several asteroids, which crashed into the dinosaurs. Then there was a burst of circles**.

Another gust of wind blew the small dinosaur far away, blowing the flesh of the large dinosaur apart. In Mongolia, a sandstorm blows from the west to the east and from the host to the south. Later, the world's most poisonous "poison" appeared in the river orange, and the dinosaurs were poisoned and died after drinking it.

If a meteorite crashes into the deep ocean, then the meteorite dissolves. But the meteorite crashed into the shallow waters of the Yocatan Peninsula, otherwise the dinosaurs would not have perished!

Although the dinosaurs became extinct, mammals, seabirds, fish, insects and other reptiles that lived with the dinosaurs, such as snakes, crocodiles and turtles, multiplied rapidly. In the end, the ultimate master of the earth evolved-the noisy forest species. We're like dinosaurs, but we've created cities, we've created vehicles that can leave the earth.

If we didn't have dinosaur fossils, we wouldn't know about dinosaurs, so dinosaur fossils are very important. If it weren't for them, we wouldn't be talking about dinosaurs here.

The reasons for the extinction of the dinosaurs are as follows:1. Crustal movement. As the earth changes over time, the earth's crust will move on land, leading to the extinction of the dinosaurs.

2. Climatic reasons. Acid rain led to the extinction of the dinosaurs. At the end of the Cretaceous period, there may have been strong acid rain, which dissolved trace elements in the soil, including strontium, and left the dinosaurs without food.

3. Volcanic eruptions, resulting in the extinction of dinosaurs without a living environment.

How did dinosaurs become extinct?

The earth's climate has changed abruptly, and the dinosaurs could not adapt.

The impact of an asteroid on the earth caused the earth to be dusty, and the dust all day long blocked the sunlight, so that plants could not light and function, and the dinosaurs starved to death without food.

In the Mesozoic Era, there were signs of dinosaur activity on land, lakes or in the air of the earth, which is known as the age of dinosaurs. About 65 million years ago, the dinosaurs disappeared without a trace, so why did the dinosaurs become extinct on the earth? This question has been pondered and studied by scientists.

A little earlier is that at the end of the Mesozoic Era, due to the movement of the earth's crust, the temperature dropped dramatically, and snow and ice covered the land. In this way, the dinosaur, as a cold-blooded animal, could not resist the invasion of the cold environment, slowly died, and disappeared from the earth.

Recently, there have been new theories that it is caused by the influence of other celestial bodies in space on the Earth. Some dinosaurologists speculate that 65 million years ago, a supernova exploded, throwing out a large number of heavy elements that landed on the earth's surface, causing the dinosaurs to become extinct. Other scientists believe that a very large meteorite hit the earth at that time, causing the water temperature of the earth to suddenly rise very high, and the meteorite also brought a large amount of radioactive elements, thus causing the extinction of the dinosaurs.

It is also believed that after a huge meteorite hits the earth's surface**, it turns into dust. Dust remained in the atmosphere and could not reflect sunlight, leaving the entire earth without sunlight, plants dying, and dinosaurs starving to extinction because they could not find food. In addition, there is a theory that a mass extinction event occurs every 2-500 million years.

Scientists who hold this view believe that the solar system passes through the wings of the Milky Way every 2-500 million years. As it flew across the wings of the Milky Way, the atmosphere was polluted with hydrogen, causing mass extinctions and the extinction of dinosaurs.

These explanations need to be further explored and studied before it is possible to find the ultimate cause of the extinction of the dinosaurs.

How did dinosaurs go extinct?

A little common sense upstairs, okay? What is not yet fully determined what is the cause of extinction. It has long been confirmed that it is caused by a chain reaction caused by the impact of a planet with a diameter of about 1 9 km.

It is said that because of the asteroid hitting the earth, there was no sunlight, and the earth entered an ice age, and most of all living things became extinct, and there was no food, and the dinosaurs could not survive.

In the Mesozoic Era, the earth was dominated by dinosaurs, whether it was plains, forests or swamps, dinosaurs were everywhere. They lived on Earth for more than 130 million years, but for some reason, the dinosaurs became extinct.

Some scientists have proposed that the extinction of dinosaurs was caused by the collision of planets, an asteroid with a diameter of 1o kilometers, hitting the earth at a speed of 100,000 kilometers per hour, raising an astonishing amount of dust when it hit, and plants could not photosynthesize, resulting in damage to the food chain, and dinosaurs could not get food and led to extinction.

Because the cosmic planet crashed into the Earth.

How did dinosaurs go extinct?

It should be because it is too big, needs too much food, and has been around for too long, so it has a greater chance of disaster and extinction.

First, let's look at why dinosaurs became extinct 65 million years ago.

Dinosaurs first appeared from the end of the Permian to the beginning of the Triassic period. The reason why dinosaurs at that time were able to dominate for nearly 200 million years was that most of the area was desert at that time, and the dinosaurs at that time had a small metabolism and a strong ability to save water; Most of the other animals need a lot of water every day, so that they will soon become extinct in the arid environment, so that the dinosaurs have more competition and survival space in the future.

At the end of the Cretaceous period, when the dinosaurs became extinct, most of the dinosaurs were not only very large, but also had to consume a huge amount of food and water every day, plus they were slow to run (even if the carnivorous dinosaurs ran relatively fast, they were not good at long-distance running, and they were still dead).

As for the speculation about the extinction of the dinosaurs, there are the following points:1Comet collision says 2The orogeny says 3Volcanic eruptions say 4Warm-blooded animals say 5If you don't understand these doctrines, you can look at the following or check.