Difference between mechanical and chemical digestion:

Mechanical digestion: Mechanical digestion involves mastication, the use of teeth to tear and crush food, and churning in the stomach.

Chemical digestion:

Chemical digestion involves the action of enzymes to break down complex molecules into simple structures. Proteins are digested into their constituent amino acids, polysaccharides are digested into simple sugars (e.g., glucose), and lipids are digested into fatty acids and glycerol.