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Female fertility is affected by age. Age is thus a major fertility factor for women. Menarche, the first menstrual period, usually occurs around 12-13, although it may happen earlier or later, depending on each girl.
en.wikipedia.orgFertility reduction and the quality of family planning ...... 22. Bosnia and Herz egovin a. Russian Fe de ra on. Re public of Moldov a. *. Рис.1: Коэффициент.
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Fertility is the natural capability to produce offspring. As a measure, fertility rate is the number of offspring born per mating pair, individual or population.
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