1. The scientific study of prehistoric life

1. Belonging to or existing in times before recorded history

2. Long duration of existence

3. Possessing great power or strength

4. A feature of sauropod dinosaurs

5. An extinct reptile that lived millions of years ago

6. Extremely large or great

7. Of great size or extent

8. The hard parts of a vertebrate skeleton

9. Belonging to a period long ago

10. Of enormous size

11. Of considerable size, extent, or intensity

12. A living being, especially an animal

13. A cold-blooded vertebrate animal

14. A plant used for food or medicine

15. Extremely large in size

16. A large, non-human animal

17. Of extraordinary size

18. Having a great height