Question

Which answer best characterizes when mass extinctions occurred in the Phanerozoic Eon?

Question 1 options:

There were no mass extinctions in the eon


There was one mass extinction at the end of the Permian


There were mass extinctions at the end of the Ordovician and Permian


A mass extinction marked the end of each era

Answer 1

There were mass extinctions at the end of the Ordovician and Permian