Scientists believe that evolution is gradual. However,extinction,which is a part of the evolutionary story,is often 'sudden' and 'abrupt' and also group-specific. Comment on whether a natural disaster can be the cause of the extinction of species.

(N/A) Natural disasters,such as earthquakes,volcanic eruptions,or asteroid impacts,can indeed cause the extinction of species.
Throughout the long history of life on Earth,there have been five major episodes of mass extinction.
The sudden extinction of the highly successful dinosaurs during the $Cretaceous$ period of the $Mesozoic$ era is a prime example. This event is widely believed to have been caused either by the impact of an iridium-rich meteorite or by rapid global cooling.