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for the world as a whole, how many years has life expectancy at birth increased?
a. 5 years
b. 8 years
c. 10 years
d. 12 years

Explanation:

Based on global demographic and public health data (from sources like the WHO and UN), over recent decades, the global average life expectancy at birth has increased by approximately 10 years, driven by advancements in medicine, nutrition, and public health infrastructure.

Answer:

c. 10 years