The chemical found in tears and saliva that hydrolyzes the peptidoglycan in certain bacterial cell walls is

The correct answer is "lysozyme".

Explanation:

Lysozyme is a type of enzyme that catalyzes the hydrolysis of the cell walls found in certain types of bacteria. Lysozymes are found in tears, saliva and sweat as an adaptation of the body to fight against bacteria found in the environment. Other body fluids such as the mucosa found in nasal cavity also contain lysozymes.