The most common, accurate, and safest system of measurement in almost all countries is the:

The crown of the primary maxillary incisors is wide with a ___________________ and marginal ridges on the lingual.

Fill in the blank(s) with the appropriate word(s).

The normal respiratory rate for an adult ranges from:

A. 8 to 10 breaths/min. B. 10 to 12 breaths/min. C. 12 to 15 breaths/min. D. 12 to 20 breaths/min.