Question

physical properties can be observed and measured without changing the substances a. appearance b. composition c. property d. all of the above

Explanation:

Physical properties of a substance can be observed and measured without changing the substance's composition. Appearance is a physical - property, and in general, physical properties include aspects like color, state, etc. which are about appearance and other measurable characteristics that don't involve a change in composition.

Answer:

D. All of the above