We think of our muscular system as the system that us move around. it also functions on an internal level by food movement in the and both parts of the digestive system.

Stomach and small intestine

Explanation:

Muscular systems serves in movement through its association with skeletal system. Smooth muscles are the type of muscles that are located in the walls of hollow internal organs such as in lining of stomach and small intestine. The involuntary contraction of smooth muscles in the wall of stomach and small intestine serves to move as well  as mix the food with digestive juices.

answer; i believe the correct answer is (replication is not conservative);

it is either c or d and i know for sure it is not a or b