Which of the following hypotheses would address the question of why salivary amylase and lingual lipase do not work in the stomach?
1) Salivary amylase and lingual lipase are denatured by the acidic environment of the stomach.
2) Salivary amylase and lingual lipase are not produced in the stomach.
3) Salivary amylase and lingual lipase are only active in the mouth and esophagus.
4) Salivary amylase and lingual lipase are inhibited by other enzymes present in the stomach.