Answer:
A
Explanation:
if there is a reliable resorse then that means the research was looked through every last bit and not just lazy writing
Answer:
Adaption to the land and its resources
Explanation:
migrants and their descendants pushed south and east, adapting as they went.
Meriwether Lewis and William Clark helped open the American frontier to settlement by exploring the regions further out west. They mapped these territories and found accessible routes, so that Americans could move further out west and settle the land before the Europeans could claim it. There was also a smaller objective of studying the science and possible economic qualities.
