You are presented with the question "What do constructions by earthworms help to do?" and the following answer choices: 
- compact soil
 - moisten soil
 - agriculture
 - to move people
 - relocation
 - aerate soil
 - survival
 - dry out soil

Now knowing that earthworm burrows help aerate soil, which is also good for plants and most species construct burrows, choose the best answer.


 

      aerate soil   