Scientists Evaluating the Cretaceous Mass Extinction Have Concluded That

Multiple Choice

Scientists evaluating the Cretaceous mass extinction have concluded that

A) only an extraterrestrial impact could have caused such a big extinction event.
B) climate change would not have been involved in producing the extinctions.
C) ecological factors such as disease and competition probably caused the dinosaurs to go extinct.
D) the asteroid impact was probably the triggering event for the extinction.