Why is the interdependence of the worms and plants an example of commensalism?

The reason why the interdependence of the worms and plants are example of commensalism is because of the process they show in which when the plants die, the worms dig air holes to their roots in which the worms make this in a way of having a place to live. It is because commensalism is where two organisms are being paired up in means of the other to benefit and the other to be harmed or benefit.