THE AUTHOR MENTIONS THE EXTINCTION OF THE DINOSAURS IN THE 2ND PAR...
31. The author mentions the extinction of the dinosaurs in the 2nd paragraph to emphasize that _____________. A. Earth's climate has changed significantly since the dinosaurs' extinction B. the cause of the dinosaurs' extinction is unknown 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
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