AP Biology Quiz
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NATURAL SELECTION
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In a coastal grass population, blade waxiness varies continuously. After a decade of frequent salt spray, plants with higher waxiness produce more seeds per plant than less waxy plants. Over four generations, the mean waxiness increases from 4.1 to 6.3 (arbitrary units), while the variance stays similar. Which pattern best illustrates the type of natural selection acting on waxiness in this population?
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