What is the most significant reason for the dramatic increase in expected life span over the last 100 years?
a. Better living habits
b. Improved surgical techniques
c. The development of antibiotics and immunizations
d. A decrease in the number of people living in poverty
c
FEEDBACK: a. The development of antibiotics and immunizations has had the most significant effect on life span.
b. The development of antibiotics and immunizations has had the most significant effect on life span.
c. Correct.
d. The development of antibiotics and immunizations has had the most significant effect on life span.
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