Which one moves in energy levels: protons, neutrons, or electrons

electrons

Explanation:

Electrons revolve around the nucleus in a fixed circular path termed “orbits” or “shells” or “energy level.”

The region where an electron is most likely to be is called an orbital. Each orbital can have at most two electrons. Some orbitals, called S orbitals, are shaped like spheres, with the nucleus in the center.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.