An _______ is a cut with smooth edges, made with a knife or other sharp object

For an adult horizontal premolar bitewing, position the image receptor so that the anterior edge lines up:

a. behind the distal half of the canine. b. between the first and second premolars. c. behind the distal half of the first premolar. d. in front of the mesial half of the second premolar.

The cause of most human cancers is __________

Fill in the blank(s) with correct word