Fact 1: Earthworms are important deposit feeders that help form and enrich soil.

Fact 2: Tulips perform best in a sandy, organically enriched soil.

Given the two facts above, answer the question "Earthworms help form and add what to soil" with the following options: 
- Sediment
 - organic material
 - Converting waste.
 - bacteria
 - heat
 - Chemical energy
 - grass
 - acidity


 

  organic material       