The most crucial factor that enabled people to survive the oppression of enslavement, difficulties of immigration, and impoverishment induced by industrialization was:

answer; foreign services officers;

answer; randomized controlled trials;

answerimpossibility;

the following are the list of answers for the topic "the shower":

unconditioned stimulus - hot water

unconditioned response - pain

neural stimulus that becomes the conditioned stimulus - toilet flushing

conditioned response - leaping out of the shower after flush or jumping out odf the shower