How many different chemical substances are known or suspected to function as neurotransmitters?

In the 18th century, the German philosopher ____________________ proposed that human beings are born with certain mental structures, such as an understanding of cause-and-effect

Fill in the blank(s) with correct word

Tark has a reputation for being cool and calm. However, when he was accused by a fellow student for making a pass at that teen's girlfriend, Tark lost his temper. Which type of trait would Allport say Tark was exhibiting in this particular situation?

A. Cardinal trait B. Central trait C. Secondary trait D. Surface trait