Fact 1: Earthworm burrows help aerate soil, which is also good for plants.

Fact 2: Earthworms Earthworms are in the phylum Annelids.

Given the two facts above, answer the question "What burrows help aerate soil, which is also good for plants?" with the following options: 
- leaves
 - adding heat
 - Exfoliation
 - good
 - roots
 - wind
 - rocks
 - annelids


 

        annelids 