Physics, 15.10.2019 06:30, joelpimentel

The life expectancy in the united states increased more than 30% from 1930 to 2015. which factor could have contributed to this increase?
a better medical facilities and treatments
b decreased farmland
c increased food insecurity
d refusal of vaccines

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The life expectancy in the united states increased more than 30% from 1930 to 2015. which factor cou...