Why were many of the machines that sped up production and travel invented during the 18th and 19th centuries?
a. rulers were finally funding scientific research.
b. there was finally a need for scientific discoveries.
c. actually, most of them were produced during the 17th century.
d. there was a heightened interest in science during this time.

How did the mountains on the oregon trail influence the timing of pioneers’ travels? a.) the pioneers wanted to avoid times when there was snow in the mountains. the pioneers wanted to spend as much time as possible enjoying the mountain scenery. b.) the pioneers crossed the mountains in late fall when the trees were bare and the views were good. c.) the pioneers were rugged people who were not impacted by the terrain they crossed at any time.