What was the first substance identified that prompted the study of inorganic materials?

Approximately what percent of newborns have life-threatening renal malformations?

a. 3% c. 15% b. 6% d. 10%

A patient who will not tolerate oxygen by mask or cannula might benefit from:

A. a smaller face mask. B. blow-by oxygen. C. positive pressure ventilation. D. no supplemental oxygen.