The answer is "D. They transported goods across desert regions."
1. St. Marks
2. The mountains in the west were taller than the mountains in the east.
3. The middle United States has fewer changes in elevation than the western United States.
Answer:
Explanation:
Honstley I don know the answere I research and found this, but i;m not sure if this answeres your question. And this is blank cause I found nothing and I am sorry for this fausle answere I will keep trying to find an answere and give my feed when I find some info. Thank you!