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A woman is an adult female human being, as contrasted to an adult male, which is a man. The term woman (irregular plural: women) is used to indicate biological sex distinctions, cultural gender role distinctions, or both. Womanhood is the period in a female's life after she has transitioned from a girl.
A girl is a female human child, as contrasted to a male child, which is a boy. The term girl is used to indicate biological sex distinctions, cultural gender role distinctions, or both. After she matures, a girl becomes known as a woman, with certain colloquial exceptions (see terms, below).
In terms of sex, women have various sexual characteristics that differentiate them from men. In women, the sex organs are involved in the reproductive system, whereas the secondary sex characteristics are involved in attracting a mate or nurturing children.
Although fewer females than males are born (the ratio is around 1:1.05), women make up the majority of the adult population. This is because males of all ages have a slightly higher death rate (even in the womb) and women live, on average, five years longer than men. This is thought to be a result of a combination of factors: genetics (redundant and varied genes present on sex chromosomes in women); sociologySociology is the study of social rules and processes that bind and separate people not only as individuals, but as members of associations, groups, and institutions. A typical textbook definition of sociology calls it the study of the social lives of huma (such as military serviceMilitary service is service in the armed forces of a nation or the military arm of a political organization. Many nations, such as Israel, mandate a certain period of military service, either for all able-bodied males or for all citizens. See also Nationa); healthHealth can be defined negatively, as the absence of illness, functionally as the ability to cope with everyday activities, or positively, as fitness and well-being (Blaxter 1990) In any organism, health is a form of homeostasis. This is a state of balance-impacting choices (such as use of cigaretteA cigarette is a small paper-wrapped cylinder (generally less than 10cm in length and 10mm in diameter) of cured and shredded or cut tobacco leaves which is ignited at one end and allowed to smoulder for the purpose of allowing inhalation of its smoke fros and alcoholIn general usage, alcohol (from Arabic al-khwl , or al-ghawl ) refers almost always to ethanol, also known as grain alcohol and often to any beverage that contains ethanol (see alcoholic beverage . This sense underlies the term alcoholism ( addiction to a); the presence of the female hormone estrogen, which has a cardioprotective effect in premenopausal women; and the effect of high levels of androgens in men.
After the onset of menarche, most women are able to become pregnant and bear children. The study of female reproduction and reproductive organs is called gynecology. Women generally reach menopause in their late 40s or early 50s, at which point they can no longer become pregnant.
In general, women suffer from the same illnesses as men; however there are some sex-related illnesses that are found more commonly or exclusively in women.
Biological factors are usually not the sole determinants of whether persons are considered (or considers themselves) woman or not; some women can have abnormal hormonal or chromosomal differences (such as congenital adrenal hyperplasia or other intersex conditions), and there are women without typical female physiology ( transgendered or transsexual women). (See gender identity.)