Rosa, a doctoral student in psychology, observes that one of her young study participants grimaces after taking a bite of broccoli. his facial expression is an example of

Rosa, a doctoral student in psychology, observes that one of her young study participants grimaces after taking a bite of broccoli. His facial expression is an example of:

A behavior

Explanation:

In Psychology, behavior is the external reaction of an individual towards a thing. For example, if you say good morning to someone then the next person gives you a smile then it is a behavior.The emotions and thoughts don't come under behavior category. In this situation, Rosa observes that one of her young study participants grimaces after taking a bite of broccoli. His facial expression is an example of a behavior.

The holy roman empire.