Which bachelor in paradise couples are still together 2021

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.

you should think about the answers you give and expect the same form your questions.

answer; individualist culture;

answer; positive reinforcement;