Answer:
The teeth mechanically break down the peanut butter and jelly sandwich into smaller parts to increase surface area and make it easier to digest later in the stomach. Saliva also chemically breaks down carbohydrates in the bread and jelly along with any bacteria.
The three major classes of nutrients that undergo digestion are proteins, lipids (fats) and carbohydrates: Proteins are degraded into small peptides and amino acids before absorption. Chemical breakdown begins in the stomach and continues in the small intestine.
Explanation:
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