Final answer:
The assertion that fundamental personality traits predict various significant life outcomes, such as mental health, happiness, and even mortality, is true. Research, including the Five Factor Model, evidences the stability and influence of traits like conscientiousness, agreeableness, and neuroticism. Moreover, cultural and evolutionary perspectives enrich our understanding of personality development.
Step-by-step explanation:
The statement that individual differences in fundamental personality traits predict important life outcomes such as mental health, happiness, marital stability, occupational success, and mortality is TRUE.
Research supports that certain personality traits can influence various life outcomes. For example, depression, anger, and anxiety have been linked to disease and mortality. Additionally, the Five Factor Model, which includes conscientiousness, agreeableness, neuroticism, openness, and extraversion, shows that these traits are stable over time and may significantly affect personal and career relationships. Furthermore, cultural and evolutionary psychology provide insight into how personality traits develop and the impact of heritability on these traits. Traits such as sociability, aggression, and optimism also influence one's personality, according to trait theorists. In essence, personality and its traits play a crucial role in shaping our lives.