The distinctive feature of the psychodynamic perspective is its emphasis on
a. natural selection. b. brain chemistry. c. unconscious conflicts. d. learned behaviors.

C. Unconscious Conflict

Explanation:

According to psychodynamic perspective, the behaviors and feeling that possessed by every individuals are strongly influenced by underlying unconscious mind that most people don't even aware of.

In our life, the things that we think as right often conflicting with the unconscious desire which often represent what we actually feel. This conflict often lead to psychological disorder that often handled by the psychiatrists.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane