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Solve the system by substitution.
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Respiratory System
The biological system consisting of specific organs and structures used for gas exchange in animals and plants, primarily involving the inhalation of oxygen and the exhalation of carbon dioxide in humans and other mammals.
Menarche
The onset of menstruation.
Menstruation
Menstruation is the monthly process by which the female body sheds the lining of the uterus, usually associated with bleeding, denoting the non-pregnant state.
Primary Aging
The gradual and inevitable process of bodily decline that occurs throughout life, independent of disease or environmental factors.
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