Why was the establishment of the EPA necessary?
because Spiro Agnew could not be relied on
because the new environmental regulations needed oversight
because Carson outlined this plan in her book "Silent Spring"
because the energy crises demanded such an administrative body

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.

answer; when circuit courts do not agree on a decision in similar fact pattern;