<unk>  is the natural capability of giving life. As a measure,<unk>  Rate" is the number of children born per couple, person or population. This is different to<unk> ecundity, which is defined as the potential<unk> or reproduction (influenced by gamete production,<unk> ertilisation and carrying a pregnancy to term). In the English language, the term was originally applied only to<unk> emales, but increasingly is applied to males as well, as common understanding of reproductive mechanisms increases and the importance of the male role is better known. Infertility is a deficient<unk> .
Human<unk>  depends on<unk> actors of nutrition, sexual behavior, culture, instinct, endocrinology, timing, economics, way of life, and emotions.  Animal<unk>  is no less complex, and may display astounding mechanisms.
Fertility
Sexual maturity
Menstrual cycle
Sex and illness
Tanner stage
Gestation period
Obstetrics
Prognosis