pick from the following. a). Tertiary. b). Jurassic. c). Paleogene. d). cretaceous.
Q: Answer the following question given this paragraph: At the end of the Cretaceous Period, or 65 million years ago, all dinosaurs (except those which led to birds) went extinct. Some scientists believe a possible cause is a collision between the Earth and a comet or asteroid. The collision could have caused tidal waves, changed the climate, increased atmospheric dust and clouds, and reduced sunlight by 10-20%. A decrease in photosynthesis would have resulted in less plant food, leading to the extinction of the dinosaurs. Q: All dinosaurs (except those which led to birds) went extinct at the end of which period? A:
A:
d).