The amount of material that will reduce the intensity of the primary beam to one-half its original value is the

Respiratory rate relates to age in in that it

a. decreases with age. b. increases with age. c. decreases from infancy through childhood and then increases. d. remains the same throughout life.

All caries start as incipient lesions and all incipient lesions progress to overt caries

A) Both statements are true. B) Both statements are false. C) First statement is true, second statement is false. D) First statement is false, second statement is true.