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The answer is A. Competition
Because once the successional plants are estabilished they compete with pre existing plants for resources.The early relationship between pioneer plants and successional plants is facilitation because environmental factors also play a role in growth of successional plants.When the successional plants become well estabilished they compete with the pioneer plants to remove them,as the name suggests successional.
B)predation word will not be used because the successional plants are not directly harming pioneer ones.
C)parasitism-same explaination as B.
D)Mutualism-This term is not used because both are not benefitting pioneer ones are harmed gradually and there is no direct interaction between the two.
E)Commensalism-No direct interaction.
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