Astronomers often develop their ideas . Which response completes the sentence with a collective noun

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; ///he could not explain why the continents drifted;

answer; biological;

answer; goals and feedback are present;