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Natural ratio[ edit ] World map of birth sex ratios, In a study aroundthe natural sex ratio at birth was estimated to be within a narrow range of 1. This assumption has been questioned by some scholars.

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Human sex at birth was also analyzed and used as an example by Jacob Bernoulli Ars Conjectandiwhere an unequal sex ratio is a natural example of a Bernoulli trial with uneven odds.

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Environmental factors[ edit ] Effects of Married woman want casual sex Belleterre Quebec change[ edit ] Various scientists have examined the question whether human birth sex ratios have historically been affected by environmental stressors such as climate change and global warming.

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High birth sex ratios, some claim, may be caused in part by social factors.

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He compared the sex ratio in East and West Germany for the years towith genetically similar populations.

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Natural factors[ edit 100 free sex Gary girls The natural factors that affect the human sex ratio are an active area of scientific research. Helle et al. Finally, when the white births were divided into Hispanic and non-Hispanic possible sinceit was Naked massage Wheeling that both white subgroups suggest an increase in male births.

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