Final answer:
When group members exhibit unique behavioral patterns or communication to help the group function, they have assumed a role. Social roles are defined by culturally shared knowledge and can vary across different settings, influencing our behavior.
Step-by-step explanation:
When group members exhibit unique behavioral patterns or communication that they develop overtime to help the group function in some way, they have assumed a role. These roles are defined by culturally shared knowledge, where nearly everyone in a given culture knows what behavior is expected of a person in a given role. Social roles can vary across different settings, influencing and dictating our behavior to the extent that our identity and personality can vary with context.