The author mentions the extinction of the dinosaur...

Câu hỏi: The author mentions the extinction of the dinosaurs in paragraph 2 to emphasize that?

A Not all mass extinctions have been caused by human activity.

B Actions by humans could not stop the irreversible process of a species' extinction.

C Earth's climate has changed significantly since the dinosaurs' extinction.

D The cause of the dinosaurs' extinction is unknown.