Answer:
The correct option is: a. digestion
Explanation:
Digestion is the process by which the large complex molecules of food are broken down into small molecules. The two types of digestion in a human body are: Mechanical digestion and Chemical digestion.
Mechanical digestion includes physical breakdown of complex food molecules into simpler molecules.
Whereas, chemical digestion is a process by which the digestive enzymes help in the breakdown of complex food molecules into simpler molecules.
