Crowns are made of:

For every kilogram (2.2 pounds) of body weight, it is estimated that the body creates approximately ____ of new blood vessels.

A. 25 inches B. 25 feet C. 25 yards D. 25 miles

Which of the following causes AC interference artifact?

A. Involuntary movement due to Parkinson's disease B. Voluntary movement, such as talking or chewing gum C. Oil, lotion, dirt, or hair under the electrodes D. Lead wires crossed and not pointed toward the hands and feet