Paleozoic Era (541–252 million years ago)

Question 1

Q: What major event marked the Cambrian Period?

Answer 1

A: The Cambrian Explosion: rapid diversification of multicellular life.

Question 1

Q: What important animals evolved during the Paleozoic Era?

Answer 1

A:

First fish (Ordovician).
Amphibians and lobe-finned fish (Devonian).
Reptiles (Carboniferous).

Question 2

Q: What marked the end of the Paleozoic Era?

Answer 2

A: The largest mass extinction in Earth’s history during the Permian Period.