I believe the answer is b because a is out of the question because it talks about artwork
Answer:
Frequent changes in leaders so it was hard to have stability
Answer:
We already know that civilization started at The Fertile Crescent, but mostly we dont know what areas had civilizations or not. Almost every area had no civilizations but then they started to evolve like hominids for example.
Explanation:
I believe the correct answer from the choices listed above is option D. Scientists <span> like Einstein, Bethe, Fermi, Teller, and Bloch emigrate in order to escape persecution and pursue scientific research in the UNITED STATES. Since they have more freedom in that country. Hope this answers the question.</span>