Can we study the human behaviour​

Yes

Explanation:

it would be difficult since everyone is different, it would have to be unknown to the people being studied but I think if you have a large enough test group you could

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

answer; obey the closest relative's wishes;