Extinction, a word that refer to the death of one or more species in this world. A lot of organisms appeared in this world. Unfortunately, 95 percent of organisms that ever exsist in this world already extinct. Only 5 percent of the organisms that still exsist in this world until now.There are a lot of things that may trigger extinction. Humans careless activities, environmental damages, pollution, climate change, even disaster may trigger not only extinction, but also mass extinction.
Because of extinction, a lot of organisms were dissapeared from this world. More than 90 percent of the organisms that ever exsisted were already extinct. There are many organism extinction in this world. But, only five mass extinctions ever happen until now. The mass extinction in happened at the end of Ordovisium Era, The end of Devon Era, The end of Perm era, The end of Triassic Era, and The end of Creatceous Era.
The first mass extinction at the end of Ordovisium Era cause more than 90 percent of sea creature and more than 70 percent terrrestial creature include insecta extinct. This extinction was said as the largest extinction ever happen on the Earth. The others mass extinction also cause almost all of the organism varieties extinct. But, the most well-known mass extinction is The Mass Extinction that happened at the end of Creataceous Era. This mass extinction caused the Dinosaur species suddenly dissapeared from the Earth around 65 million years ago. This famous mass extinction was caused by an impact on Earth surface that come from a giant meteor. This meteor hit the Earth surface near Yucatan Peninsula with a low angle, causing tsunami happened. The impact also caused dust, gravel, rocks, and a lot of Earth materials thrown away. the dust cloud covered the sky in a long period and caused sunshine unable to reach the earth surface and automatically triggered the mass extinction.
Nowadays, although mass extinction isn't happened, a lot of organisms still in danger of extinction. Even, some of the dangered organisms aren't known yet.