Earthworms are important deposit feeders that help form and enrich soil.
Earthworms are perhaps the most familiar decomposer.
Decomposers can help form and enrich soil.
What can help form and enrich soil?

a) Most plants
b) whales
c) the Sun
d) decomposers
e) swamp vegetation
f) shrub beds
g) phytoplankton
h) fossil fuels