Question

which best differentiates between chemical digestion and mechanical digestion? chemical digestion happens in the small intestine; mechanical digestion happens in the mouth. chemical digestion involves the breaking down of food with enzymes; mechanical digestion is breaking down food by chewing and tearing with teeth. chemical digestion is the breakdown of fats; mechanical digestion is the breakdown of proteins. chemical digestion is done only by the major structures of the digestive system; mechanical digestion is done by the accessory structures of the digestive system.

Explanation:

Chemical digestion uses enzymes to break down food at a molecular - level, while mechanical digestion physically breaks food into smaller pieces by actions like chewing. The first option about locations is too simplistic as both can occur in multiple places. The third option about specific nutrient - breakdown is wrong as both can act on various nutrients. The fourth option about major and accessory structures is incorrect as both types of digestion involve multiple structures.

Answer:

Chemical digestion involves the breaking down of food with enzymes; mechanical digestion is breaking down food by chewing and tearing with teeth.