Which are the characteristics and organs of the digestive system of earthworms related to the type of diet of these animals?

Which are the characteristics and organs of the digestive system of earthworms related to the type of diet of these animals?
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Earthworms eat decomposing organic material and small organisms ingested together with soil particles. The digestive tubes of earthworms have special structures, like a muscular wall and a gizzard, that triturate the food and scratch it against the ingested soil particles. Since annelid digestion is exclusively extracellular earthworms also present in the posterior part of their digestive system structures like the cecum and the typhlosole that have the function of increasing the absorption surface of the intestine.
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