Generalized reciprocity involves a. gift exchange with the aim of receiving more than is given. b. giving of time, objects, and food among close kin. c. giving where a reciprocal gift is expected. d. giving gifts to everyone, including neighboring groups.

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.