How many mass extinctions were experienced on a global scale before the alarming mass extinction that's now occurring?
A) six
B) five
C) two
D) none

Question

Quizplus · Accepted Answer

Scientists have identified five mass extinctions in Earth's history: the End-Ordovician, Late Devonian, End-Permian, End-Triassic, and End-Cretaceous. We are currently in the midst of a sixth mass extinction, mainly caused by human activities.

How Many Mass Extinctions Were Experienced on a Global Scale