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A large city is located in a valley.A warm, stable air mass settles over the valley, holding the air and its pollutants in place.After a few days, the city issues a smog alert.This situation is a result of a
12-Year-Old Twins
Refers specifically to two siblings born at the same time, who are currently twelve years of age, possibly implying considerations of developmental or genetic studies.
Strength
A measure of the ability of a muscle or group of muscles to exert force for a brief period.
Onset Of Puberty
The onset of puberty is the period in which a child's body begins to develop and change into an adult body, marking the start of sexual maturation.
Developed Countries
Nations with advanced economic infrastructure, high standards of living, and a wide range of industrial and technological developments.
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