In the Strange Situation, which babies would look away from their mothers and refuse to acknowledge them upon their mothers' return?

An environmental cue or event whose significance is learned is referred to as a(n) ____

a. ?unconditioned stimulus b. ?conditioned stimulus c. ?characteristic stimulus d. ?uncharacteristic stimulus

For Freud, the major derivative of the death instinct is:

a. fear b. aggression c. competitiveness d. isolation