Mark the mouse was raised in a cage all by himself. When he was about 6 months old, Mickey the mouse was placed into Mark's cage. However, Mark did not attack Mickey. Mark's lack of aggression suggests that
A) Mickey was castrated early in life.
B) Mickey immediately made an appeasement gesture.
C) Mark immediately made an appeasement gesture.
D) Mark was castrated early in life.
E) Mickey immediately began marking his territorial boundary.

Question

Quizplus · Accepted Answer

Mark's lack of aggression suggests that he was castrated early in life, which can reduce aggressive behavior in animals.

Mark the Mouse Was Raised in a Cage All by Himself