the prisoner's dilemma game illustrates why the evolution of cooperation is difficult. what facilitates cooperation in this game

Which of the following is not a common characteristic of agricultural villages throughout the world?

Describe how gravity and convection work together to move the plates in the plate tectonics theory

Which statement best explains how world war ii to end the great depression? a. new job opportunities opened as the united states produced more military products. b. the u.s. army provided new jobs that paid better than any other work at the time. c. people had to worry more about war problems than about the economic crisis. d. the war caused people to trust the economy enough to spend more money.