Because - previous extinction events happened due to natural causes. Over the last 200 years, the human race has wiped out more species through their selfish domination of the planet - than the last 20,000 years of 'natural' disasters !
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Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
They are the end-Ordovician extinction, end-Devonian extinction, end-Permian extinction, the Triassic extinction, end-Cretaceous extinction.
Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
Each era on the scale is separated from the next by a major event or change. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions.
the mass extinction
There were five major extinction events in the past. They are called the Cretaceous-Tertiary (or K-T) extinction event, the late Devonian mass extinction, the Permian mass extinction, the Ordovician-Silurian mass extinction and the Triassic-Jurassic mass extinction event.
There have been five major extinction events during Earth's history. These events are known as the Ordovician–Silurian, Late Devonian, Permian–Triassic, Triassic–Jurassic, and Cretaceous–Paleogene extinction events. Each event resulted in a significant loss of biodiversity and had profound impacts on the evolution of life on Earth.
The current events for the month of September 2014 in Virginia include many different festivals and fairs. Five County Fair, Charles City County Ruritan Steak Feast and Music in the Mountains are all on the current events calendar.
At the Jurassic-Cretaceous boundary, significant events such as volcanic activity, climate change, and possibly asteroid impact led to the extinction of certain species, including dinosaurs. These events caused widespread environmental disruptions, leading to the decline and eventual extinction of many species.
Because mass extinction events marked the loss of a number of a species to fill the available ecological niches, these events correspond to geological period boundaries.
current events in santo domingo