PART II: Fill-intheblanksfshon answer [20 total points; 7 questions, variable pointslquestio n] 11. The four features of tit-for-tat that make it an effective cooperation-inducing strategy in a prisoner's dilemma environment are: _______________________________: ' and [4 points] 12. Extemalities are when actions of one player lower others' and when actions of one player increase others' [2 points] 13. Positive externalltles can lead to positive feed back when: [2 points] 14. Information is perfect whenever: ; ; and [3 points] 15. An evolutionary stable strategy is: [2 points] 16. An is based on a whenever the individual organisms in a given population have the same strategy phenotype; otherwise it is based on a [3 points] 1?. People are guilty of when they do not participate in the creation or maintenance of a ' and people are guilty of when they overuse a [4 points}