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The earth's worst mass extinction was:

Late Devonian
Ordovician-Silurian
Permian-Triassic
End Triassic
Cretaceous-Tertiary

Respuesta :

camrron10
The Permian–Triassic (P–Tr) extinction event, colloquially known as the Great Dying, the End ...... Jump up ^ St. Fleur, Nicholas (16 February 2017). "After Earth's Worst Mass Extinction, Life Rebounded Rapidly, Fossils Suggest". New York Times ...
drewcer9181

Permian-Triassic ..........................................................

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