Why was North America’s human landscape closely mirrors that of its physical environment: varied, rich, and constantly changing . and how did it contribute to the growth of the United States?

( national geographic)

ur answer is in the it

i think the correct answer would be adjustments in life roles.  this causes for one to adjust or change totally his/her career or lifestyle since the present is not beneficial to the life role he is at. for instance, you became a mother you would of course stop going to malls and enjoying life outside. you would be staying at home taking care of your child.