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“When the dinosaurs go extinct and 75 percent of life goes extinct after a meteor hits the planet, that's an era boundary. That's when we change from the Mesozoic to the Cenozoic.” — Kenneth Lacovara
When the dinosaurs go extinct and 75 percent of life goes extinct after a meteor hits the planet, that's an era boundary. That's when we change from the Mesozoic to the Cenozoic.