Which of the following of Cattell's traits is most similar to extraversion?

Eli enjoys woodcarving. Although none of his teenage friends are interested, he often spends hours creating several different pieces

His enjoyment of the task is all his own, and he rarely shows others his work. Many would call his motivation __________ in nature. a. instinctual b. arousal c. extrinsic d. intrinsic

Biological factors which may be related to personality include

A) blood type. B) skull shape. C) levels of mercury or lead in the body. D) eye movements.