When people are placed into groups based on physical or biological traits that they have inherited, they are being classified by
a. ethnicity
b. gender
c. dialect
d. race

What does it mean to say that "service sector" jobs are predominant in europe's mixed economies today? a. that jobs where people work in factories predominate b. that jobs where people do something for others predominate c. that jobs where people work the land predominate d. that jobs in government predominate