justify the study of Nigeria people and culture for having positive impact in uniting Nigeria's ethnic group

Study of the Nigerian people and its vast spread of ethnic groups can help in unifying the diverse ethnic groups as one understand the culture conventions and principles associated to each ethnic group making them to understand one another which can promote unity.

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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.

me no say