An environmental cue or event whose significance is learned is referred to as a(n) a. unconditioned stimulus b. conditioned stimulus c. uncharacteristic stimulus d. characteristic stimulus

An environmental cue or event whose significance is learned is referred to as a "conditioned stimulus".

Conditioned stimulus refers to a part of the learning theory Classical Conditioning, in which conditioned stimulus is a neutral boost that triggers a type of reaction when combined or connected with an unconditioned stimulus. The reaction activated at that point is alluded to as conditioned response. 

Where are the following

Complementary goods. they go together, thats why one price increase and the others demand increases