minimally, how many half siblings would have to benefit for an altruistic action with cost (c) of 0.25 fitness units and a benefit (b) per relative of 0.10 fitness units to evolve?

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