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  Strengths and Improvement Opportunities Ch 4 Quiz B Course: AP Environmental Science ‡ Instructor: SHANNON ‡ Questions: 30 QUESTION A: I only C: III only D: I and II only E: I, II, an III Which of the following conditions must be present for natural selection to occur in a population? I. There must be enough genetic variability within the population. II. The trait must be heritable III. The trait must not have changed within a population over time A: I only B: II on...