The undigested substances are passed out of the body through the

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Undigested substances are passed through the large instines I hoped I helped you

The gastrointestinal tract (GI) is a system of organs which are included in the consumption,  digestion, absorption and removal of waste products. The GI organs are: the mouth, esophagus, stomach, small intestine, large intestine, and anus.

The undigested substances are passed out of the body through the anus. The anus is the last part of the digestive tract which removes the waste.