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Girls' bodies undergo gradual changes during puberty, analogous to but distinct from those experienced by boys. Puberty is the process of physical changes by which a child's body matures into an adult body capable of sexual reproduction to enable fertilisation. It is initiated by hormonal signals from the brain to the gonads-either the ovaries or the testes. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sexual organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when the child has developed an adult body. Until the maturation of their reproductive capabilities, the pre-pubertal,sometimes regarded as demeaning and lady was the term of courtesy, woman is the designation preferred by most modern female adults: League of Women Voters; American Association of University Women. Woman is the standard feminine parallel to man. As a modifier of a plural noun, woman, like man, is exceptional in that the plural form women is used: women athletes; women students. The use of lady as a term of courtesy has diminished somewhat in recent years ( the lady of the house ), although it still survives in a few set phrases ( ladies' room; Ladies' Day ). Lady is also used, but decreasingly, as a term of reference for women engaged in occupations considered by some to be menial or routine: cleaning lady; saleslady. See also