Answer:
Procedure.
Explanation:
A procedure is a process by which the hypothesis is tested under controlled [variables].
Could be experiment, could be experimental design. This question is a little confusing, but that's okay. I tried my best.
Answer:
The 1920s and the 1950s in America were more similar than they were different.
Explanation:
During the 1920s and the 1950s, the United States was economically prosperous because of the surplus of jobs and new consumer markets. Also, in both decades, the U.S. faced the issue of terrorism and communism.
It reflected in the structure of the federal government by making it balance which means that each arm of government is not powerful than others.
