What type of current should be avoided for clients who are pregnant, have high blood pressure, or have a pacemaker?

A characteristic of all inorganic substances is that they _____.

All lasers work by selective _____, a process that turns the light from the laser device into heat.

What is the shortest and least penetrating light of the electromagnetic spectrum?

The oxidation of haircolor is an example of a _____.

Which LED therapy is associated with increasing circulation and improving collagen and elastin production in the skin?

Change in the form of a substance that does not cause a chemical reaction is a(n) _____ change.

An atom or molecule that carries an electrical charge is a(n) _____.

A chemical combination of matter in definite (fixed) proportions is a _____.

The branch of science that applies to substances that contain carbon is called _____ chemistry.