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The medial labial consonants f and m in wīfmann coalesced into the modern form "woman", while the initial element wīf, which meant "female", underwent semantic narrowing to the sense of a married woman ("wife").It is a popular misconception that the term "woman" is etymologically connected to "womb".The ovaries, in addition to their regulatory function producing hormones, produce female gametes called eggs which, when fertilized by male gametes (sperm), form new genetic individuals.
Later at puberty, estrogen feminizes a young woman, giving her adult sexual characteristics.In mature women, the breast is generally more prominent than in most other mammals; this prominence, not necessary for milk production, is probably at least partially the result of sexual selection.(For other ways in which men commonly differ physically from women, see man.) During early fetal development, embryos of both sexes appear gender-neutral.The word girl originally meant "young person of either sex" in English; The term girl is sometimes used colloquially to refer to a young or unmarried woman; however, during the early 1970s feminists challenged such use because the use of the word to refer to a fully grown woman may cause offence.In particular, previously common terms such as office girl are no longer widely used.The vagina is used in copulation and birthing, although the term vagina is often colloquially and incorrectly used in the English language for the vulva or external female genitalia, which consists of (in addition to the vagina) the labia, the clitoris, and the female urethra.The breast evolved from the sweat gland to produce milk, a nutritious secretion that is the most distinctive characteristic of mammals, along with live birth.An imbalance of maternal hormonal levels and some chemicals (or drugs) may alter the secondary sexual characteristics of fetuses.Most women have the karyotype 46, XX, but around one in a thousand will be 47, XXX, and one in 2500 will be 45, X.At birth, babies may be assigned a gender based on their genitalia.In some cases, even if a child had XX chromosomes, if they were born with a penis, they were raised as a male.