The term potluck refers to a competitive feast that occurs on the North Pacific Coast of North America, where the sponsoring community gives away food and wealth items (blankets, copper plates) to visitors from other villages in order to increase the prestige of the village hosting.

A. True
B. False

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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.