Mccrae and costa believe the influence of heredity is most pronounced in the factors of

The correct answer is extraversion and neuroticism. 

According to personality psychologists, McCrae and Costa, from the five universal personality traits (Openness, Conscientiousness, Extraversion, Agreeableness and Neuroticism), extraversion and neuroticism are two traits or factors that are most heritable or appear to have a genetic basis. Extraversion refers to qualities such as enjoying the company of others over solitude, being outgoing and sociable. Neuroticism on the other hand refers to tendencies towards low or depressed moods, moodiness, irritability and other emotional and psychological issues.

President Hoover had mutual self-help in the country in times of national difficulty. He broke down this sense of responsability, of individual generosity to individual.

He also thought that the business cycle would correct itself.

Lol social studies and History aren't really my subjects but this is what I could remember from class and my book.

Hope this helps!!! :D