You are a researcher studying 2 species of flowering plants in a meadow. You observe that species A is found in nutrient-rich soil while species B is found in nutrient-poor soil. You do a transplant experiment where you remove all of the existing plants from your experimental plots and then plant Species A in nutrient-poor soil and species B in nutrient-rich soil. You find that Species A does not grow in nutrient-poor soil and species B grows in nutrient-rich soil. Which of the following scenarios explains the observed species distribution and experimental results?

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