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
The relationship between trees and certain mushrooms that  grow beneath them is beneficial to both organisms.
A(n) beneficial relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally.
Which type of relationship exists when a certain type of tree’s roots need a fungus present in order to grow normally?