All decomposers are bound together in a complex feeding web. They turn
organic wastes into a usable humus for the soil.
http://greenwestmichigan.cfsites.org/files/food_web_of_the_compost_pile.jpg
Earthworms are perhaps the most familiar decomposer. By blending
soil and organic matter in their digestive track, they produce stable,
nutrient-rich aggregates that improve the structure of soil.
(Special thanks to Seattle Tilth Association).
http://compost.css.cornell.edu/HomeCompostingSlides.ppt
Biochemical Reaction