Question

What is an example of a physical change that occurs during digestion?

1 Digestive enzymes in the stomach break down proteins into amino acids.

2 Saliva in the mouth converts starches into simple sugars.

3 Pancreatic enzymes break down fats into fatty acids.

4 Teeth grind and tear food into smaller pieces in the mouth.

Answer 1

Number 1. Digestive enzymes in the stomach break down proteins into amino acids