Select the following men in order to the date of their explorations, starting with the earliest: 1. Leif Ericson 2. Christopher Columbus 3. Marco Polo 4. Napoleon Bonaparte

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.

think its caste system

explanation:

answer; a splinter party;