As an infant, Stephanie received many penicillin injections from the doctor. When she later saw a photographer in a white coat that was similar to the doctor's coat, she started to cry. This is an example of .

Classical conditioning.

Explanation:

Classical conditioning is defined as learning process in which two stimuli is linked togather to generate a response. Biologically influential and strong stimuli is subjected with formerly neutral stimuli.

According to the question, as Stephanie has got many penicillin injections from doctor , she recognizes that injections received from white-coat people(doctor) give her pain. Due to this learning, she recognized white coat photographer as doctor who will give injection and thus, started to cry

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

barack obama

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