Answer:
I believe it would be fossil succession
Answer:
D) During the Depression neither of the two shifted much.
Is this supposed to be multiple choice?
Answer:
The U.S using nuclear weapons to end World War II.
Explanation:
The arms race went hand in hand with the Cold War, which took place 20 or so years after World War II. It was a tense situation and resulted in the U.S. and Russia stockpiling nuclear weapons as a means of protection. When America used two atomic bombs on Japan, the devastation it caused led other countries to be concerned if they were going to be next.