Which of the following are possible causes of mass extinctions that scientists have identified

over harvesting, pollution, introduction of invasive species such as new predators and food competitors

Explanation:

The main cause of mass extinction is Humans cause extinction of a species through overharvesting. The second main cause is pollution., introduction of invasive species such as new predators and food competitors, habitat destruction, overhunting and other influences. Another very important cause of mass extinction is the unsustainable human population growth.

The five mass extinction events are

Ordovician Mass Extinction

Devonian Mass Extinction

Permian Mass Extinction

Triassic - Jurassic Mass Extinction

and Cretaceous - Tertiary (or the K-T) Mass Extinction.