Until the 1930s, one third of the deaths in the 20-45 year old age group were due to _____. Antibiotics changed that, but the use of these drugs in ways which allowed one or more bacteria to survive has led to the evolution of _____.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.