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

The interdependence of worms and plants can be considered an example of commensalism because the worms benefit from the plant's presence (as they feed on decaying plant matter and help improve soil quality), while the plants are not significantly affected by the worms' presence. In other words, the worms benefit from the relationship, but the plants are neither harmed nor helped. This one-sided benefit is characteristic of commensalism.