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?

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As shown in the diagram, oak trees are initially abundant but diminish over time as they are replaced by other trees. Grasses, annuals, and shrubs also diminish, most likely due to being outcompeted by larger trees which shade the understory.

It is unlikely that oak trees would alter the pH to hurt their own growth.

Oak trees with deep roots should outcompete shrubs in obtaining water.

Environmental pollutants would likely affect all plants similarly.