Cats are cats because ummmmm
god
Yes :)
The answer would be Humanistic Psychology.
The achievement of self-actualization was first discussed by Abraham Maslow as part of his hierarchy of needs, and it represents the completition of the highest level of the hierarchy and the emergence of the "fully functional person". Self-actualization is basically the achievement of meaning in one's own life.
A quantity that does not equal 0, a real nonzero number must be positive or negative and a complex nonzero can have real or imaginary parts