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"Womb" is actually from the Old English word wambe meaning "stomach" (modern German retains the colloquial term "Wampe" from Middle High German for "potbelly").
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.
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.
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.
This contrasts with the typical male karotype of 46, XY; thus, the X and Y chromosomes are known as female and male, respectively.