Examlex
Acids and acid-forming compounds that fall from the atmosphere to the earth's surface
Circulatory System
The system responsible for the movement of blood and lymph through the body, delivering oxygen and nutrients to cells and removing waste products.
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.
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