(N/A) Decomposition is the process by which decomposers (such as bacteria and fungi) break down complex organic matter into simpler inorganic substances like carbon dioxide $(CO_2)$,water $(H_2O)$,and various nutrients.
$1$. The raw material for decomposition is called detritus,which includes dead plant remains (leaves,bark,flowers) and dead remains of animals,including fecal matter.
$2$. The process involves several steps: fragmentation,leaching,catabolism,humification,and mineralization.
$3$. Earthworms are often called 'farmer's friends' because they aid in the breakdown of complex organic matter (fragmentation) and help in loosening the soil,which facilitates the decomposition process.