Question

Before the cells in a person's body can use the food that the person eats, the food must be
A.
physically heated to 100°C.
B.
physically changed into a solid.
C.
chemically changed into heat.
D.
chemically broken down into sugar.

Answer 1

D. Chemically broken down into sugar.

Explanation: Digestive enzymes chemically break down foods (especially carbohydrates) into simple sugars like glucose, which cells can then use for energy; proteins and fats are likewise broken into amino acids and fatty acids.