Paul ekman and his colleagues gathered abundant evidence supporting the universality of basic facial expressions of emotion.

seven

Explanation: Paul Ekman is an American psycologist and he is one of the first ones that studies the human emotions and the facial expressions. He declared that there are seven basic emotions that are universal for people all over the world. These emotions are: happiness, sadness, surprise, fear, anger, disgust, and contempt

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.