What Is A Mass-Extinction?
An extinction event is defined as a sharp decrease in the number of species over a short period of time. A mass extinction is further defined based on four points, pattern, duration, breadth and magnitude, and the event must:
- be confined to a short period of geological time
- Affect a wide variety of clades, that occupy a wide range of Habitats
- And eradicate a high proportion of species.
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