The structuralists failed because their results were inconclusive since they were extremely subjective. With that kind of results, it was impossible to form a grand theory of the movement, and eventually people stopped trying because they realized that the sentiment was bound to fail.
Flow most likely arises when one's activity entails a balanced ratio of A) skills to challenges, I believe.
B is the correct answer boiiiiiiiiiiii
He was trying to get African American equality and segregation abolished. He wanted to end racism everywhere.
The point of checks and balances was to make sure no one branch would be able to control too much power, and it created a separation of powers. Here are some examples of how the different branches work together:
The legislative branch makes laws, but the President in the executive branch can veto those laws with a Presidential Veto.
The legislative branch makes laws, but the judicial branch can declare those laws unconstitutional.