Mass Extinction

About 65 million years ago, abnormal things happened on our planet - it can be seen in the fossil record. The rich fossils of the early rock formations did not exist in the later rock formations. From small marine organisms to large dinosaurs, all kinds of animals and plants suddenly disappear

The species has become extinct. Scientists estimate that at least 99.9% of species of animals and plants are now extinct. Therefore, the annihilation of dinosaurs like Tyrannosaurus Rex and Triceratops about 65 million years ago is not particularly noteworthy - about 50% of animals and plants that survived at the same time disappeared from what the scientists called death Then. extinction

Mass extinction - At least half of all species die in a relatively short period - only a few times in the history of our planet. The greatest annihilation occurred about 250 million years ago, at that time 95% of species may be extinct

The greatest extinction in Earth history affected various species including many vertebrates. (250 mya)

Scientists have stated that the main extinction of non-bird dinosaurs is K-T extinction because it occurred in the late Cretaceous to the early Tertiary. Why not use C-T? Geologists use "K" as an abbreviation for Cretaceous. "C" is the previous abbreviation, Cambrian.

The extinction that occurred 65 million years ago destroyed about 50% of animals and plants. This event is very striking, it shows an important turning point in the history of the earth, and it marks the end of the geological era known as the beginning of Cretaceous and Tertiary.

Probably the most famous mass extinction is the eradication of all the dinosaurs on the earth. This is the fifth mass extinction incident known as Cretaceous - Tertiary extinction, or simply K - T annihilation. The mass extinction of the Permits (also called "extinction") is much more extinct species, but the KT extinction is known for the reason that the masses are interested in dinosaurs. . The annihilation of K - T is the borderline between the Cretaceous that ended in the Cretaceous and the beginning of the third phase of the beginning of the Cenozoic (this is the age we are still alive). The extinction of K - T occurred about 65 million years ago, estimated to account for 75% of all species on Earth.

The distinction between "extinction" and "extinction of the background" is very important in understanding the importance of mass extinction. For thousands of years, scientists can expect that some species will be extinct - this is "extinction of the background". However, during mass extinction many species have been extinct in a shorter period of time. It can be said that life history on the earth is interrupted by "boredom" (the background is in danger) and "panic" (mass extinction). Back in Bd, Kolbert explored why fungi spread so quickly around the world. Because it is a component of a popular pregnancy test, some people think humans have misdirected Bd to the world in the 1960s. Others are guessing that after the human spread the bullfight in Asia, Africa and South America, the bullring of North America will spread to other continents.