Rock A formed from liquid rock and rock B formed from small Pieces of rock in a different time , are rock A and B the same or different types of rocks ?

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