Reciprocity means: Select one: a. responding to another's actions with a similar action. b. deriving utility from an action that will cause another's utility to increase. c. doing good things for people and asking nothing in return. d. deriving utility from the action of a stranger.

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.

answer; lead-based paint;

answer; geography and region;

i do not know the question, but all of the above are correct; ///good luck;