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Answer: Directional selection occurs when individuals with traits on one side of the mean in their population survive better or reproduce more than those on the other. ... Directional selection does the “heavy lifting” of evolution by tending to move the trait mean toward the optimum for the environment.
OBSERVATIONAL LEARNING is associated with the fearless peer experiment. The experiment demonstrates OBSERVING OTHERS AND POSITIVE BEHAVIORS.
Fearless peer experiment is about a video show about a small boy who was having fun playing with dogs. What was seen inside the video encourages the watchers to lose the fear they have for strange dogs.
Because their use is not sustainable because their formation takes billions of years to renew them
the answer is the facial nerve