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Answer:
Explanation:
Native trees have better disease and pest resistance, but how a tree is planted and the site that it is planted in can affect its overall health. Trees that become diseased are often attacked by insects (pests). This is because the disease weakens the tree's defenses, making it vulnerable to infestation by pests.
A. A was deposited most recently in the diagram above, as it is located in the top, showing that is the newest layer to be added.