The textbook states that "eysenck worked diligently to unearth [the] biological basis" of the basic dimensions of personality. he appears to have been most successful in the case of:

He appears to have been most successful in the case of "extraversion".

Extraversion is one of the five personality traits of the Big Five identity theory. It demonstrates how cordial and social an individual is. An individual who scores high in extraversion on an identity test is the life of the gathering. They appreciate being with individuals, partaking in parties, and are brimming with vitality. An individual low in extraversion is less friendly and is progressively happy with working independent from anyone else.  

People high in extraversion on a vocation test tend to search out the organization and incitement of other individuals.

nigger, that word was originated for white folks   to keep black people under

and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.