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The first fossilized evidence of sexual reproduction in eukaryotes is from the Stenian period, about 1.05 billion years old. [19] [20]Biologists studying evolution propose several explanations for the development of sexual reproduction and its maintenance.
The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction.Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system. [1]
Adolescent health creates a major global burden and has a great deal of additional and diverse complications compared to adult reproductive health such as early pregnancy and parenting issues, difficulties accessing contraception and safe abortions, lack of healthcare access, and high rates of HIV, sexually transmitted infections and mental health issues.
In population ecology and demography, the net reproduction rate, R 0, is the average number of offspring (often specifically daughters) that would be born to a female if she passed through her lifetime conforming to the age-specific fertility and mortality rates of a given year.
Contraception, also known as birth control, is a form of reproductive technology that enables people to prevent pregnancy. [9] There are many forms of contraception, but the term covers any method or device which is intended to prevent pregnancy in a sexually active woman.
Document Number Nine (or Document No. 9), more properly the Communiqué on the Current State of the Ideological Sphere [1] (also translated as the Briefing on the Current Situation in the Ideological Realm [2]), is a confidential internal document widely circulated within the Chinese Communist Party (CCP) in 2013 by the General Office of the CCP.
Doc is an American medical drama television series developed by Barbie Kligman and premiered on January 7, 2025, on Fox. The series is based on the Italian television series Doc – Nelle tue mani, which has been broadcast on Rai 1 since 2020. In February 2025, Fox renewed the series for a second season. [1]
The American Fertility Society (now American Society of Reproductive Medicine) Classification distinguishes: . Class I—Müllerian agenesis (absent uterus). This condition is represented by the hypoplasia or the agenesis (total absence) of the different parts of the uterus: