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_____7.One example of commensalism is when the plant like fern is attached on a branch of a tree.Why is the interaction called commensalism?

A. Both a branch of a tree and a fern benefit from each other.
B. Only a branch of a tree is benefitted from the relationship.
C. A fern benefits from the relationship while a branch of a tree is neither harmed nor benefitted.
D. They compete each other.