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…showed last 75 words of 1277 total…that cause the same reaction when trying to determine what genetic make-ups and environmental backgrounds give the best reaction to an occurrence. Perceptions can change over time within a persons mind after knowledge and trials have accumulated with the results a person wants to see or result in. Perception will never be a given, it will always change from generation to generation, time periods to time periods, and especially from one person to the next.