Mass Extinction

Abstract Several large species extinctions are taking place in the history of the earth. As a result of the Cretaceous - Tertiary border disappearance (K - T), it was at least three quarters of all known species including dinosaurs at that time. The cause of this mass extinction is a controversial subject among scientists, but the fossil evidence of its occurrence is abundant. Introduction The extinction of K - T occurred 65 million years ago. Many species have died out and lost their lives. Today, evidence of this extinction can be seen in the fossil record.

Probably the most famous mass extinction case is a case of destroying 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 Permian age (also called "extinction") is much more extinct species, but the KT extinction is known for the reason that the general public is interested in dinosaurs. . The extinction of K - T is the borderline between the Mesozoic and Tertiary that began during the Cretaceous, which was the new generation (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.

To understand the importance of mass extinction, it is very important to distinguish between "extinction mass extinction" and "background extinction". For thousands of years, scientists have predicted that certain 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. In life history on the earth there is "long lasting boredom" (background extinction), it can be said that it is interrupted by "panic" (mass extinction). Returning to Bd, Kolbert explored why fungi spread so quickly around the world. Because it is a component of popular pregnancy tests, some people argue that humans mistakenly spread Bd around the world in the 1960s. Others speculate that after the human spread the bullfight in Asia, Africa and South America, the bullring of North America spreads to other continents.

The earth history was interrupted by mass extinction case 1 and the biological crisis fundamentally changed biodiversity and biogeographic patterns 1, 2. In general terms, the increase in cosmopolitanism of animals continues after mass extinction 1, 2, 3, 4. For example, the Permian-Triassic mass extinction of the early Triassic aftereffect known as the largest extinction event 5, 6 is dominated by a few widely distributed rich classifications worldwide homogeneous It is considered to be "disaster fauna". Features 1, 6, 7, and 8. A similar model is also proposed for the impact of mass extinction at the end of the Triassic. However, explicit quantitative testing of international changes in the extinction of large species is rare and does not contain information from 3 or evolutionary relationships limited to narrow geographical areas (systematic development ) 2, 3