premise: This is a mutually beneficial relationship where the hyphae of the fungus grow around the roots of trees, forming a sheath of tissue.
hypothesis: A(n) beneficial relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally.
hypothesis_graph_structure: A(n) beneficial relationship<>exists<>when a certain type of tree's roots need a fungus present in order$$$a certain type of tree's roots<>need<>a fungus present in order