Detritus refers to small pieces of organic or inorganic material that have broken down or decomposed. This can include fragments of plants, animal remains, and other debris found in various environments. In ecosystems, detritus plays a crucial role as it provides nutrients for soil and supports the growth of microorganisms. In marine environments, detritus often consists of dead plant and animal matter that sinks to the ocean floor. This material serves as food for a variety of organisms, including detritivores like earthworms and crabs, which help recycle nutrients back into the ecosystem.