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Digestion: breaking complex food into simple nutrients. Path: Mouth (chewing, saliva starts digestion) โ Oesophagus (food pipe, moves food to stomach) โ Stomach (acids break proteins, churns food) โ Small intestine (most nutrients absorbed here, 6-7m long) โ Large intestine (water absorbed, 1.5m long) โ Rectum โ Anus (waste expelled).