Q: All dinosaurs (except those which led to birds) went extinct at the end of which period?


Read this paragraph and choose the correct option from the provided answers:

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.

 Choices:

- Tertiary

- Jurassic

- Paleogene

- cretaceous


A:
cretaceous