_is the muscular contractions of the digestive tract, which helps push food through the body.​

Explanation:

Peristalsis is the muscular contractions of the digestive tract, which helps push food through the body.​ During the process of digestion, the muscles contract and relax accordingly for the food to food through the alimentary canal.

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it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added