What is the lead disk that is placed over the opening of the x-ray head referred to?

The largest bone of the face, which forms the upper jaw, the hard palate, the floor of the nose, and the lower portion of each eye socket, is the:

a. mandible. b. zygoma. c. frontal bone. d. maxilla.

Current evidence suggests that ____ of cancers may be caused by infectious agents.

A. 10% B. 20% C. 30% D. 35%