An EBAS begins with an introduction which establishes the central problem or situation to be explored and identifies the essential question at the center of the task.

#2 the answer is d

#3 the answer is a

#4 the answer is b

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast

a

explanation:

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."