The term "brain drain" refers to A. the decreased quality of the collegeminus−educated workforce. B. the diminishing returns to studying for an exam. C. the negative impact on brain function of an individual's overinvestment in human capital. D. highly educated individuals who leave developing countries for highminus−income countries.

The map above shows the expansion of the greek empire. which statement best describes the greeks during the 4th century bc? a. greek expansion was stopped by the persian empire. b. the greek empire controlled parts of africa, europe, and asia. c. the greeks were threatened by barbarian tribes in europe. d. greece did not have friendly relations with ancient egypt.