The diagram above shows the progression of ecological events after a fire in a particular ecosystem. Based on the diagram, which of the following best explains why the oak trees are later replaced by other trees?AEventually the other trees grow taller than the oak trees and form a dense canopy that shades the understory.BOak trees alter the pH of the soil, making the forest better suited for shrubs and other trees.CRoots of shrubs proliferate in the soil of the forest and prevent the oak trees from obtaining water.DOak trees succumb to environmental pollutants more readily than do either the shrubs or the other trees.

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