Final answer:
Nearly complete dinosaur skeletons were discovered in North America between 1870 and 1900. The Cretaceous Period was a time when dinosaurs reached their peak in size and distribution, and it ended with their extinction. The end of the Mesozoic Era saw the extinction of dinosaurs, but other reptiles survived and evolved into modern reptiles. C. 1870 and 1900
Step-by-step explanation:
The nearly complete dinosaur skeletons were discovered in North America between 1870 and 1900.
During the Cretaceous Period, dinosaurs reached their peak in size and distribution. The period ended with the dramatic extinction of the dinosaurs.
It is important to note that the dinosaurs went extinct at the end of the Mesozoic Era, which was associated with the impact of a large asteroid and massive volcanic activity. Many other reptiles survived and eventually gave rise to modern reptiles.