$(a)$ Bile does not contain any digestive enzyme,yet it is important for the digestion of food. Why?
$(b)$ Name the products formed after the complete digestion of carbohydrates,proteins,and fats in the small intestine.

(N/A) Bile makes the acidic food coming from the stomach alkaline,which enables pancreatic enzymes to act. Bile salts emulsify large fat globules into smaller ones,which increases the surface area for enzyme action,thereby increasing the efficiency of digestion.
$(b)$ The products formed after complete digestion are:
Carbohydrates: Glucose
Proteins: Amino acids
Fats: Fatty acids and glycerol