Question

describe the way peristalsis moves food through your digestive system. its muscles are always open allowing food to fall through. it uses gravity to push the food through. food is pushed through by eating more food. its muscles constrict and relax in waves, allowing the food to move through.

Explanation:

Peristalsis is a series of wave - like muscle contractions that propel food through the digestive tract. Muscles do not remain always open, gravity is not the main mechanism, and eating more food does not push existing food through via this process.

Answer:

D. Its muscles constrict and relax in waves, allowing the food to move through.