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Solve the system by the addition method.
Young Children
Individuals in the early stages of life, typically defined as ages newborn to 8 years old, undergoing rapid physical and cognitive development.
IQ Increases
The phenomenon where an individual's performance on intelligence tests increases over time, potentially due to education, environmental changes, or practice effects.
IQ Correlations
The statistical relationships between IQ scores and other variables, indicating how changes in IQ scores are associated with changes in those variables.
Adopted Child
A child who is legally taken and raised by parents other than their biological parents following a formal adoption process.
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