What percentage of the air we breathe is made up of oxygen?
a. 78%
b. 12%
c. 16%
d. 21%
Answer: d. 21%
Health Professions
You might also like to view...
The levels of past, family, and social history are
a. none, pertinent, extended, comprehensive. b. brief, extended. c. pertinent, extended d. pertinent, complete.
Health Professions
Right eye cataract, secondary to primary open angle glaucomatous flecks:
A) H26.222, H40.001. B) H26.221, H40.10X0. C) H26.221, H40.001. D) H40.10X0, H26.221.
Health Professions