Evolutionary psychologists believe that adaptation through natural selection occurs with psychological traits just as it does with physical characteristics. To be considered an adaptation, a trait must satisfy three criteria. Which of the following is NOT one of these criteria?
a. The trait must vary among members of the species.
b. The trait must help individuals to survive or reproduce.
c. The trait must be inheritable.
d. The trait must continue to mutate.
Answer: D. The trait must continue to mutate.