Once a bill passes both houses of congress, it must go to a(n) in order to resolve any differences between the house and senate versions of the bill.

conference committee

Explanation:

Primarily, the process of enacting a law begins with the sponsorship of a bill by the member of the house of representative and the bill is usually being sent to their committee for proper review. When simple majority of house of representative members pass the bill, then it gets sent to the senate, where the bill would also be sent to another committee in the senate for review.  

A committee which contains both members of the house and senate are usually being put in place to review any disparity between the versions of the bill raised by the senate and house of representative members respectively.  If the two chambers accept the agreements raised by the conference committee, then the bill goes back to the house and senate for approvals.  

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.

the structure of state governments are determined by. "state constitutins'

under the us constitution, all state governments are.'republics'