Only one of the statements below uses the term theory in its correct, scientific sense. which one? i have a new theory about the cause of earthquakes, and i plan to start testing it soon. i wrote a theory that is 152 pages long. einstein's theory of relativity has been tested and verified thousands of times. evolution is only a theory, so there's no reason to think it really happened.

It is "Einstein's theory of relativity has been tested and verified thousands of times".

Albert Einstein, in his theory of relativity, confirmed that the laws of physics are the same for all non- accelerating observers, and he demonstrated that the speed of light inside a vacuum is the same regardless of the speed at which an observer voyages. This is the only term theory in its correct, scientific sense .

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.