Suppose Dr.Fish has a theory that says you cannot live without two working eyes.To demonstrate this is true,Dr.Fish brings to you hundreds of living people,each of whom has two working eyes.This demonstrates

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The demonstration by Dr. Fish is an example of confirmation bias, where evidence is sought out to confirm already existing beliefs or theories. Dr. Fish's theory is confirmed by selecting only those individuals who have two working eyes and not considering those who may have lost an eye due to injury or disease but continue to live. Thus, the evidence presented is biased towards confirming the theory.