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peristalsis
contraction and relaxation of the digestive canal muscles in the wall to push food down. Happens throughout esophagus, small intestine, large intestine.
nutrition
process by which an animal takes in and makes use of food to meet the needs
Animals ingest and digest nutrients called
carbohydrates, proteins, and lipids
substances that animals require but can’t build from simpler molecules:
essential amino acids, essential fatty acids, vitamins, and minerals
Animals require amino acids ─ About half can be synthesized from __ and _ _
20, sulfer, organic nitrogen