A geographer that focuses on “human systems” will focus on the study of . A.
locations and spatial relationships
B.
the Earth’s natural systems
C.
the cultures people create
D.
natural environments

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.        

where is the

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answer; inductive techniques;