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Characteristics and organs of digestive system of earthworms

Describe the characteristics and organs of digestive system of earthworms associated to the kind of diet of such animals?

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Earthworms eat decomposing organic material and small organisms ingested altogether with soil particles. The digestive tubes of earthworms contain special structures, such as a muscular wall and a gizzard, which triturate the food and scratch it against the ingested soil particles. As annelid digestion is exclusively extra-cellular earthworms as well present in the posterior portion of their digestive system structures such as the cecum and the typhlosole that contain the function of raising the absorption surface of the intestine.

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