Earthworm burrows help aerate soil, which is also good for plants.
Dirt is really misplaced soil.
Earthworm burrows help aerate dirt,  which is also good for plants.
What does an earthworm do that would help plants?

  reusing materials
  It helps them survive
  eat the plant
  scare away birds
  reproduce
  hydrate their cells
  burrow in the dirt
  eat all the dirt