What Is The Only State Flag That Is Two-Sided?
Did You Know!
Earth has experienced 5 mass extinctions.
The first mass extinction happened as early as 444 million years ago, called the Ordovician-Silurian extinction. The subsequent mass extinctions are Late Devonian extinction, Permian-Triassic extinction, Triassic-Jurassic extinction, and Cretaceous-Paleogene extinction.
Now, are we in the sixth mass extinction?