What was the great depression? a) a time of severe decline in business activity. b) a time when our country went to war. c) a time when we left america. d)

A) A time of sever decline in business activity is your best answer

The Great Depression was the result of an economic downturn that led to the mass-fire of workers, which plunged the economy even lower, forcing many businesses to shut down. This was solved through the progress of Franklin D. Roosevelt and his "New Deal"'s, as well as the start of World War II.

~World on Fire

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs