A physician who specializes in treatment of the gums is called a periodontist.
Measure the amount of chemical used, measure the mass before and after
Answer:
Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. Besides bouncing back like an echo, waves may bend or spread out when they strike a new medium. These three ways that waves may interact with matter are called reflection, refraction, and diffraction.
Explanation:
Because without it you would have no support to stand
