Answer:
1. Ordovician Mass Extinction (about 44o million years ago)
2. Devonian Mass Extinction (about 375 million years ago)
3. Permian Mass Extinction (about 250 million years ago)
4. Triassic-Jurassic Mass Extinction (about 200 million years ago)
5. Cretaceous-Tertiary Mass Extinction (about 65 million years ago)
Explanation:
