____ located in the medulla oblongata, carotid, and aorta, sense pH, carbon dioxide, and, to a lesser extent, oxygen content in the blood and cerebrospinal fluid.

The safest emergency vehicle operator is one who:

A: is physically fit. B: drives with lights and siren. C: has a positive attitude. D: drives with due regard.

Solve the calculations using Roman numerals. 26 - 19 =

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