The reason why dinosaurs became extinct.
There are many hypotheses about the extinction of dinosaurs in the scientific community, among which the main ones are asteroid impact, weather change and disease epidemic. At present, most people accept that the dust caused by asteroid impact does not settle in the atmosphere for a long time, which leads to the death of plants without photosynthesis, which leads to the collapse of the biological chain from the bottom and the extinction of dinosaurs.
Scientists who believe that the weather made dinosaurs unable to adapt.
The latest view of dinosaur extinction
Recently, dinosaur research experts from all walks of life in the world have been controversial. A recent study by a research team led by Keller, a professor at Princeton University in the United States, shows that dinosaurs became extinct 300,000 years after an asteroid hit the earth. So the extinction of dinosaurs is not directly related to the impact of asteroids on the earth. In this regard, public opinion is controversial.
The latest paleontological research evidence shows that tropical bees survived the catastrophe that led to the extinction of dinosaurs 65 million years ago. This new discovery puts forward the theory of meteorite impact? Questioning? . Jacqueline, a researcher from New Orleans State University? Kozisek announced this new viewpoint at the just-concluded annual meeting of the American Geographic Society in 2004.
The author believes that the evidence presented by the above two experts is reliable, and the argument is pertinent only within a certain range, with high credibility.
Theoretical hypothesis of dinosaur extinction
1? Some biologists believe that there was a geological orogeny on the earth at that time. Due to the sudden growth of many high mountains on the flat land, the swamp is greatly reduced and the climate becomes less humid and warm. The respiratory organs of dinosaurs were difficult to adapt to the dry, cold and dry air, and in winter, the dinosaur's food was gone, so it was on the verge of death.
2? Some scientists speculate that the explosion of supernovae caused drastic changes in the earth's climate, which led to a sudden increase in the surface temperature and then a sharp drop.
3? There is also a theory that dinosaurs ate a lot of flowering plants, and there were many toxins in these flowers. Dinosaurs ate a lot, so they died of poisoning. The evidence is that flowering plants began to appear at that time.
4? Others ingeniously said that it was because dinosaurs, a huge animal, ate too much and kept farting, releasing a lot of methane gas into the air. Because they are too numerous and have a long life span, they have destroyed the ozone layer of the earth and caused a devastating climate.
5? Some people even say that it is the result of aliens coming to the earth to hunt, because they think dinosaur meat is particularly delicious. The evidence is that the dinosaur bones they found in the North Pole were marked by laser cutting.
6? Some experts say that dinosaurs died of cancer because the ozone layer of the earth was destroyed and the sun was shining directly.
7? Volcanic eruption said that volcanoes changed the climate of the earth, and dinosaurs died out because they could not adapt to the new climate.
8? Asteroids hit the earth, resulting in cold weather, many plants were frozen to death, cutting off the food source of dinosaurs, leading to their extinction.
9? The asteroid hit the earth, causing both earths to catch fire, and all the dinosaurs were burned to death.
10? Dinosaur sperm mutation, dinosaur eggs can not hatch small dinosaurs.
The above generally accepted theory is the meteorite impact theory. As can be seen from the above, the theories of experts are varied, strange and quite confusing. The arguments of these experts have a common feature, that is, they are not very logical, are not dominated by logical commanders, and do not like to use logic to interpret. Most theories are that blind people touch elephants. It should be pointed out that some theories are simply catching shadows, speculating casually, and almost saying whatever they want, which simply cannot stand a rebuttal. But these absurd views and theories can often be seen in the media, because they are scientists, they speak scientific language, and what they say is reasonable.
Look at the reason why dinosaurs became extinct:
1. The big secret of dinosaur extinction
2. Reflections on the teaching of dinosaur extinction in 3 1 lesson, the second volume of Chinese grade two.
3. Consequences of extinction of large animals.
4. Write a letter to extinct dinosaurs
5. Historical data of dinosaur extinction