The answer is oxygen .
Other planets don't provide life and air
Here's 5 facts about John Adams:
> Adams defended British soldiers after the Boston Massacre.
> He was a great pen pal.
> He was the principal author of the oldest written constitution still in use in the world.
> He was the first president to live in the White House.
> Adams participated in what may have been the nastiest presidential campaign in American history.
Hope this is what you was looking for! :D
Something directly associated to better transport lines: increased settlements in the West
Answer:
B. It allowed them to overthrow communist governments in favor of
more democratic leaders.
