Discovery of Cretaceous dinosaur footprints in Fujian. What are the possible causes of dinosaur extinction?

People's Daily Online Fuzhou 65438+ 10/2 (Chen Huanhuan) On June 5438+02, the Fujian Provincial Government Information Office held a press conference to announce that the late Cretaceous dinosaur footprint fossils were discovered for the first time in Longxiang Village, Lincheng Town, Shanghang County, Longyan City, Fujian Province. This is the first time that dinosaurs and their remains have been discovered in Fujian Province. According to the preliminary investigation, the origin area of this fossil is about 1600 square meters, and more than 240 dinosaur footprints have been cleared, including at least 8 trace marks such as herbivorous sauropods, large, medium and small theropods, carnivorous large three-toed theropods, two-toed deinonychus and small theropods. The origin of this fossil has the characteristics of large area, high diversity and good preservation. This discovery is also of great significance for studying the distribution and diversity of dinosaur fauna in the late Cretaceous. What are the possible causes of dinosaur extinction?

Chronic food poisoning by mistake

Some scientists think that dinosaurs died because they didn't accept some poisonous alkaloid plants. These alkaloid plants were gymnosperms such as cycads and ferns all over the world at that time, and they were used to protect their own survival and reproduction. Produce some toxic alkaloids in their own bodies, such as nicotine, palmatine, horseflies and so on. After some time-consuming dinosaurs swallowed these poisonous plants, a small amount doesn't matter, and a large amount will cause alkaloid poisoning. Just like some of our traditional Chinese medicines also contain alkaloids: if there is ephedra, our most common traditional Chinese medicine, we usually use it to treat wind-cold exterior syndrome. The general dosage is about 3 grams. If used in large quantities, people will be poisoned to death by eating a large number of alkaloids. But animals don't know, so the reason why we humans can live longer than them is reflected in our daily attention. Carnivorous dinosaurs will eat herbivorous dinosaurs, so this vicious circle will continue under the action of the food chain, which will eventually lead to the extinction of the entire dinosaur race.

The solar system in the Milky Way? Death trip?

This is generally considered by scientists to be the main reason for the extinction of dinosaurs. We all know that the nine planets in the solar system revolve around the sun. The solar system rotates around the Milky Way, and it takes 250 million years to rotate once. Under the influence of strong radioactive substances released by the center, a piece of? Dead zone? Formed in a part of the milky way galaxy. 65 million years ago? 70 million years ago, the solar system happened to be here? Dead zone? In the passage, radioactive rays attacked all living things on the earth, and dinosaurs were also wiped out in this disaster. Therefore, dinosaurs and their possible extinction during this period.

In addition, according to Darwin's theory of evolution, some scientists believe that the aging of dinosaur's own race and the failure in the evolutionary competition with emerging mammals led to the final extinction of dinosaurs. Of course, there are also oxygen excess, constipation, volcanic eruption and so on. However, scientists are still exploring the real reason for the extinction of dinosaurs. What we humans have to do is to protect our earth. When the earth is good, we humans will be good.