the intestine, with squeezing. the mouth, with chewing and saliva. the stomach, with churning and acid. the esophagus, with pushing towards the stomach.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In humans, the digestion process begins in
Possibilities:
- the intestine, with squeezing.
- the mouth, with chewing and saliva.
- the stomach, with churning and acid.
- the esophagus, with pushing towards the stomach.

the mouth, with chewing and saliva.