You are presented with the question "What are invaluable for soil health?" and the following answer choices: 
- bacteria
 - annelids
 - sharks
 - Exfoliation
 - bioaerosols
 - plankton
 - evaporation
 - sunlight

Now knowing that annelids are worms such as the familiar earthworm and earthworms are invaluble for soil health, choose the best answer.


 

  annelids       