Faced with the strange ice age, many invertebrates panicked. They have never experienced such a life. In the face of the harsh environment, despite their efforts to survive, it was still difficult for them to adapt to the living environment at that time, and both poda and archaea disappeared in this disaster.
By the end of Devonian, the creatures on the earth had a second survival test, which was mainly aimed at aquatic creatures, especially invertebrates in the ocean. At that time, the oxygen content in shallow water dropped rapidly, and invertebrates such as brachiopods and ammonites were in an extremely difficult situation.
The third extinction occurred between Permian and Triassic, which reduced the number of biological families by more than half and the number of species by at least 90%. The fourth extinction occurred between Triassic and Jurassic, during which all conodonts were extinct. You may be familiar with the fifth extinction, because the restless little star, once the overlord of the earth, had to give up the throne of hegemony and gave mankind an "opportunity."
Success is natural, so is failure.
There is an idiom called "Success is Xiao He, Failure is Xiao He", which comes from Historical Records Biography of Huaiyin Hou. It is a high generalization of Han Xin, the founding hero of the Western Han Dynasty. In a few words, I told my whole life. Han Xin's success came from Xiao He's recommendation that Xiao He killed Han Xin. Therefore, there is a saying in history that "success is Xiao He, and failure is me".
In fact, the experience of dinosaurs is somewhat similar to that of Han Xin, a famous historical figure. It was nature that made the dinosaur stand out and have the opportunity to become the overlord of the earth, and it was nature that finally made it perish and forced it to abdicate.
Why did nature make dinosaurs?
Most people know the story of the extinction of dinosaurs. In the Cretaceous period about 65 million years ago, the earth witnessed the fifth mass extinction event, the extinction of dinosaurs. There are many theories about the cause of mass extinction, such as meteorite impact theory, continental drift theory, climate change theory and so on, but there is no clear conclusion at present.
Compared with the tragic experience of dinosaurs in the later period, there may be only a handful of people who know the history of dinosaur growth. About 234 million years ago, the earth was in the Carney period, and actually a small-scale extinction event occurred. The main culprit of this extinction event was the rainstorm at that time, which lasted for 2 million years.
For creatures living in that era, they have never seen the rain stop in their lives. Therefore, this incident is also known as the "Kani flood incident". It is this continuous rainstorm that has caused earth-shaking changes in the earth's environment. The original biological chain of the earth was reorganized and shuffled, and dinosaurs took this opportunity to rise.
Why can a rainstorm last for 2 million years?
Compared with the serious consequences brought by this rainstorm, everyone may be more concerned about why the earth has ushered in this cross-century rainstorm, which lasted for two centuries, which is unimaginable.
According to records, during the Permian-Triassic period, the continents of the earth were not separated as they are today. At that time, the mainland was connected together and became a large piece. Although such a structure is conducive to maintaining the stability of the mainland, it also has some disadvantages. For example, the water vapor in the ocean can't penetrate into the mainland, but can only wander in the coastal border areas, leading to a drought in the mainland. The discovery of red sandstone by geologists can well prove this point.
The long-term imbalance between drought and flood has laid the groundwork for this cross-century rainstorm, and a crisis is gestating. Unfortunately, there is also a problem in the area called "Langlia". Volcanoes in this area have erupted for more than 500 years, and the carbon dioxide emitted during this period is difficult to count, so the temperature of the earth has risen sharply, and the temperature in some areas has risen by 7 degrees Celsius.
Driven by volcanoes, the distribution of water vapor on the earth is more uneven, and a heavy rain finally arrival the earth. At first, creatures living in arid areas had a feeling of "long drought meets rain", and once desert areas also grew green grass. However, as time goes on, some plants with underdeveloped roots are damaged, and they can't resist heavy rain. After some desperate resistance, they finally reluctantly released the hand of the land mother.
Plants with relatively developed roots are also under great pressure, constantly secreting resin to avoid being taken away by heavy rain, which is also proved by amber fossils discovered by geologists in many places during the Carney period.
What is the earth like after the rain stops?
After a long wait, the volcano in Langlia finally calmed down, the magma inside finally stopped churning and wanted to meet the earth, the crying sky finally stopped crying, and some parts of the earth were slowly returning to their original drought.
Although the earth's environment is slowly recovering, the earth's biological chain will never be restored to its original appearance. Many animals disappeared in this heavy rain that lasted for 2 million years, and many plants that could not adapt to the environment also disappeared.
It is worth mentioning that this rainstorm has brought great development opportunities to the dinosaur family, which was originally at a survival disadvantage. It is found that the number of dinosaurs accounted for about 5% of the total number of terrestrial vertebrates before the Kani flood, but after the Kani flood, the number of dinosaurs accounted for 90%. This data is based on the analysis of dinosaur fossils.
Why did the harsh natural environment create dinosaurs?
First of all, plants are in the basic position in the biological chain, which shows that the survival and development of animals are closely related to plants. After the heavy rain, the grassland on the earth has been greatly reduced, and animals used to grazing on the surface are facing a serious food crisis. Tall trees, because of their well-developed roots, have withstood the tests again and again, and most of them have survived, which just provides rich food for dinosaurs who can eat leaves on high places.
Secondly, at that time, pteridophytes were gradually reduced and replaced by gymnosperms, which were rich in fiber, and many herbivores could not digest this substance and faced great danger of extinction. But dinosaurs are different. Dinosaurs have long and narrow intestines, which can digest the fiber materials in gymnosperms well.
Finally, the continents were connected at that time. After the dinosaur family flourished, it began to expand its territory rapidly, and dinosaurs appeared in many parts of the mainland, laying a solid foundation for dinosaurs to dominate in the future.
abstract
It is not difficult to find that the earth's ecology is not static, it is always in dynamic change. When there is an extinction disaster that most creatures can't accept, it may just give marginal creatures a huge opportunity. If we can seize the opportunity, we can defeat the original superior creatures and turn over to become the master of the earth.