Which structure uses only mechanical digestion food? (peristalsis only) liver esophagus stomach large intestine

The answer is **esophagus**.Here's why:* **Mechanical digestion** involves physically breaking down food into smaller pieces. Peristalsis, the rhythmic muscular contractions that move food through the digestive tract, is a form of mechanical digestion.* The **esophagus** *only* uses peristalsis to move food from the mouth to the stomach. No chemical digestion occurs here.* The **stomach** uses both mechanical (churning) and chemical digestion (acids and enzymes).* The **large intestine** primarily focuses on water absorption and waste compaction, but some bacterial digestion (chemical) does occur.* The **liver** produces bile, which is important for *chemical* digestion of fats in the small intestine, but the liver itself doesn't perform mechanical digestion.