the addition of acids to create a ball of food the secretion of pepsin to change proteins to peptides the breakdown of food substances by digestive juices the squeezing of food through the intestines
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these indicates a physical change that occurs during the process of digestion?
Possibilities:
- the addition of acids to create a ball of food
- the secretion of pepsin to change proteins to peptides
- the breakdown of food substances by digestive juices
- the squeezing of food through the intestines

the squeezing of food through the intestines