Students are investigating processes that happen during digestion of a hamburger. They make a table to classify processes as physical changes or chemical changes. RowStructure
Process
1. Mouth
Chewing with teeth and mashing with tongue breaks hamburger into smaller pieces.
2. Mouth
Substances in saliva combine with the burger bun to produce simple sugars.
3. Stomach
Stomach juices mix with burger patty proteins, breaking them down into simple amino acid molecules.
4. Large intestine
Bacteria break down fiber from lettuce and tomato and produce simple sugars.
Which row describes only a physical change during digestion?
