what is conserved in physical changes?\n○ shape\n○ energy\n○ mass\n○ density

Brief Explanations:

A physical change alters the form of a substance but not its chemical composition. Shape changes (e.g., cutting paper) and density changes (e.g., water freezing to ice) occur in physical changes, so they are not conserved. While energy is conserved universally, the question focuses on properties directly tied to the substance's identity in physical changes. Mass remains constant in physical changes (law of conservation of mass), as no atoms are created or destroyed.

Answer:

mass