sentence2_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
sentence1: This means that in order to be healthy, you need to eat certain foods that are beneficial for your body type and stay away from others.
sentence2: A(n) beneficial relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally.
question: Which type of relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally?