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

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