Answers with Explanation:
1. Broken down into smaller molecules by bile salts.
Lipids - Lipids are considered important when it comes to the structure of living cells. It also aids in the cell's function. Through the process of emulsification, the lipids are broken down into smaller lipid by bile salts.
2. Broken down by enzymes embedded in the cellular membrane of the intestinal wall.
Carbohydrates - Carbohydrates (starches) are broken down into simple sugars by enzymes that are embedded in the cellular membrane of the intestinal wall. Then, it can be absorbed as nutrient in the body. The chemical digestion of starches starts in the mouth.
3. Must first be broken down into smaller units before it can be absorbed into the intestinal wall.
Proteins - Proteins are broken down into smaller units by hydrochloric acid and pepsin. After which, it can now be absorbed into the intestinal wall. Protein digestion starts in the stomach and ends in the small intestine.