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The fifth extinction being the Permian(?) Extinction, when the comet hit earth eradicating almost all the life on our planet. The sixth extinction would be several million years later, when humans destroy themselves with our own weapons.
The fifth extinction being the Permian(?) Extinction, when the comet hit earth eradicating almost all the life on our planet. The sixth extinction would be several million years later, when humans destroy themselves with our own weapons.