what is conserved in physical changes?\no shape\no energy\no mass\no density

Brief Explanations:

In physical changes, mass is conserved according to the law of conservation of mass. Shape can change (e.g., molding clay), energy can be transferred or transformed in physical - change processes like melting which requires heat input, and density can change as volume may change during physical changes (e.g., ice - water phase change).

Answer:

mass