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Natural ratio[ edit ] World map of birth sex ratios, In a study around , the natural sex ratio at birth was estimated to be close to 1. This assumption has been questioned by some scholars. This has been explained by sex differences in genetic and biological makeup, with boys being biologically weaker and more susceptible to diseases and premature death. It has been proposed that these environmental factors also explain sex differences in mortality. For example, in the United States, as of , an adult non-elderly male is 3 to 6 times more likely to become a victim of a homicide and 2. For example, the male to female ratio falls from 1. In the aggregated results of 56 Demographic and Health Surveys [20] in African countries, the ratio is 1.This list for sex ratio is based on the estimates by the United nations for year and world bank for year Sex ratio at birth (male births per female births) from The World Bank: Data. The human sex ratio is the number of males for each female in a population. This is a list of sex For example, The World Factbook in reported Switzerland's sex ratio at birth as , while Switzerland's Federal Office of Statistics in ..the end of the story look at the video above ↑ ↑ ↑

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