Social epidemiology is a branch of epidemiology that focuses particularly on the effects of social-structural factors on states of health. Social epidemiology assumes that the distribution of advantages and disadvantages in a society reflects the distribution of health and disease.
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B is the answer because the Europeans were immune to the virus and the Indians weren't so they grew very ill which helped the Europeans.
A leap year is a calendar year that contains an additional day added to keep the calendar year synchronized with the astronomical year or seasonal year.
Answer: The Native Americans
Explanation: Hope this help you! :)
