What produces chemicals such as digestive enzymes that digest food?

It depends on which type of enzyme and what it digests.
for example, the salivary amylase that digests starch in oral cavity is produced by salivary glands
meanwhile lipase that digests protein is produced only in pancreas

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.