THE AUTHOR MENTIONS THE EXTINCTION OF THE DINOSAURS IN THE 2ND PA...

12. The author mentions the extinction of the dinosaurs in the 2nd paragraph to emphasize that _____________. A. actions by humans could not stop the irreversible process of a species' extinction B. the cause of the dinosaurs' extinction is unknown C. not all mass extinctions have been caused by human activity D. Earth's climate has changed significantly since the dinosaurs' extinction