Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Digestion and Absorption Digestion is the mechanical and chemical break down of food into small organic fragments. It is important to break down macromolecules into smaller fragments that are of suitable size for absorption across the digestive epithelium. Large, complex molecules of proteins, polysaccharides, and lipids must be reduced to simpler particles such as simple sugar before they can be absorbed by the digestive epithelial cells. Different organs play specific roles in the digestive process. Answer: digestion
Output:
What process is used to chemically and mechanically break down the food you eat into smaller parts?