An incomplete protein contains fewer than all nine essential amino acids, however incomplete proteins can be combined in meals to make a complete protein (for example by combining rice and beans or peanut butter and toast).
Psychology is the study of behavior and mind, embracing all aspects of conscious and unconscious experience as well as thought. It is an academic discipline and an applied science which seeks to understand individuals and groups by establishing general principles and researching specific cases.
Psychology is a discipline that has been working on the study of mental processes and behavioral patterns of human beings for over one hundred years. No other mental health discipline can lay claim to such an extensive investigation of the human psyche and this longevity is one of the primary reasons the field of Psychology is held in such high esteem in society in general.