Which organ in the digestive system contains a layer of muscle that allows its walls to move to push food through it?
A) liver
B) mouth
C) pancreas
D) small intestine

answer:

It is actually ,The large, hollow organs of the GI tract contain a layer of muscle that enables their walls to move. The movement of organ walls—called peristalsis—propels food and liquid through the GI tract and mixes the contents within each organ.

Explanation:

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81 is a composite number.