The answer is: A. The federal government
The federal government can determine the criteria of immigration depending on what the nation currently need. (the president would have the highest influence in determining the criteria).
For example, when the nation need large number of labors, the federal government could make the criteria for immigration become a little bit loose so many people can come in. If the nation need capital injection, the government could change the criteria based on personal net worth.
I believe the answer is: Replication
During a replication, Researchers would repeat the research that conducted in the past, but being done with different situations or different type of subjects. The purpose of such research is to determine if the finding on the previous research would be applicable under different circumstances.
I believe it is false. Hope it helps!
Answer:
To make the country laws and for the people to follow them in that country it doesn't matter where you're from you still have to follow the country's laws when you stay in it.
The answer is 1950-2000, China reached 1 billion people in population in 1982.