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96% of the marine species were extinct in Permian mass extinction.

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The Cretaceous extinction occurred 65 million years ago.

Non-avian dinosaurs, ammonites, rudists, nannoplankton, and some marine reptiles were completely extinct in Cretaceous mass extinction.

Since background extinction is a result of the regular evolutionary process, the rate of the background extinction is steady over geological time.

Mass extinction refers to the extinction of a large number of species within a short period of geological time. “Duck Tadorna Rusty Threatened With Extinction Bird” (CC0) via Max Pixel 2.

Mass extinction occurs due to rapid environmental changes.

Background extinction and mass extinction are the two types of extinction of species.

There is also a psychological component to a mass murder: it can be seen as a release of tension, or a “blowing up.” While mass murders are done for reasons similar to serial killings, mass murders do not have the long-term planning and focus that serial killings do.

A recent example of a mass murderer is Jared Lee Loughner, pictured above.

The end of a species on the earth is known as extinction.

There are two types of extinctions as background extinction and mass extinction.

Loughner killed 6 people during the 2011 Tuscan shooting.