1.Scientists believed that chemical
Answer:
an automatic response established by training to an ordinarily neutral stimulus.
Explanation:
For example, the smell of food is an unconditioned stimulus, a feeling of hunger in response to the smell is an unconditioned response, and the sound of a whistle when you smell the food is the conditioned stimulus. At this point, the response becomes known as the conditioned response.
I believe the answer you're looking for is "Specificity".
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Failure, because stats show that more people have nightmares than good dreams. so failure is a bad thing so it would follow under a nightmare which by stats makes the answer failure. i don't feel like putting all the stats on here so plz take my word for it.
