You are presented with the quiz "Earthworms eat dirt, which is good for what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "earthworm burrows help aerate soil, which is also good for plants" and "earthworms crawl through the soil, eating sediments or dirt directly". 

So, what's the best answer to the question?


 

  plants         