Changes in sea level over time have drastically altered the appearance of the continents. the following images represent north american sea levels at various stages between the cambrian and cretaceous. to illustrate changing sea levels, arrange the images from the oldest (1) to the most recent (5) by dragging the numbered labels to the images

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.

answer conditional instability;

the climate of each region is different from one another.