Astronomers have observed that the universe is expanding and is accelerating in all directions. using this evidence, astronomers have hypothesized that a huge explosion called the big bang created the universe. which of the following correctly describes the big bang?
theory
fact
opinion
none of these

The answer is THEORY cause that's the right answer.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism