Furthermore, the theory suggests that East German birth sex ratios should generally be lower than the observed sex ratio in West Germany for the same years, over time. Hormones act by triggering or regulating chemical reactions in the body. They find an increased excess of male births during periods of the exogenous stress World War II and during warm years. A scientific paper published by Jacobsen reported the sex ratio forchildren born in Denmark between — Journal of Criminal Justice. Over articles have been published in various journals. Moreover, these scientists claim that the trends they found in Finland are similar to those observed in other countries with worse pollution and much greater pesticide use.
More data is available for humans than for any other species, and the human sex ratio is more studied than that of any other species, but interpreting these statistics can be difficult.
Human sex ratio
Journal of Marriage and the Family. High birth sex ratios, some claim, may be caused in part by social factors. Bars on graphs may look different. For humans, this term is usually applied after the eighth week of development. Some researchers have in part attributed the high male to female sex ratios reported in mainland China in the last 25 years to the underreporting of the births of female children after the implementation of the one-child policythough alternative explanations are now generally more widely accepted, including above all the use of ultrasound technology and sex-selective abortion of female fetuses and, probably to a more limited degree, neglect or in some cases infanticide of females. Hormones control many important body activities, such as growth. One Chinese Bachelor's Search for Love".