In one study of more than 900 New Zealanders,emotionally reactive and impulsive 3-year-olds developed into somewhat more impulsive and conflict-prone 21-year-olds.This best illustrates the long-term stability of

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The study suggests that the emotional reactivity and impulsiveness observed in 3-year-olds remained relatively stable as they grew into 21-year-olds, indicating the long-term stability of temperament. Adaptive capacity refers to an individual's ability to adjust to new situations, which was not the focus of the study. Epigenetic marks refer to modifications to genes that can be influenced by environmental factors, and object permanence refers to a cognitive development milestone that occurs during infancy.

In One Study of More Than 900 New Zealanders,emotionally Reactive