Earthworms are important deposit feeders that help form and enrich soil, and earthworms are perhaps the most familiar decomposer. Given these facts, what can help form and enrich soil among the following options:
- Most plants
 - whales
 - the Sun
 - decomposers
 - swamp vegetation
 - shrub beds
 - phytoplankton
 - fossil fuels


 

    decomposers     