Which theorist developed a hierarchy of needs to explain the different priorities we may assign to aspects of human motivation? ?

Toward the end of the roman empire, what caused a decrease in the use of coined money tell me now

Einar sees alexandra every day across the room in his history class but has never talked with her. einar likes the way alexandra looks, including the way she dresses and how she wears her hair. he's even more attracted to her apparent intelligence and the way she handles herself in class discussions and during interactions with the instructor. he'd like to know more about her, so he asks one of his friends about her. einar, using a passive strategy to gain information about her, is probably in the preinteraction awareness stage of any relationship that might develop between them. t/f

From where do ocean waves obtain their energy