Explanation: Saprotrophs (decomposers or osmotrophs): They are bacteria and fungi which obtain energy and nutrients by decomposing dead organic substances (detritus) of plant and animal origin.

• The decomposition products such as inorganic nutrients released in the ecosystem are reused by producers and thus recycled.
• Earthworms and certain soil organisms (such as nematodes, and arthropods) are detritus feeders and help in the decomposition of organic matter and are called detrivores.

Source: Shankar IAS