Nature versus nurture
Environmental role on IQ

Studies have consistently shown that environmental factors can have a significant impact on IQ. Access to quality education has been found to have a positive effect on IQ, with one study indicating that access to quality preschool education had a lasting impact on IQ scores up to age 35. Malnutrition in early childhood has been linked to lower IQ scores later in life, while supplementation with certain nutrients such as iron and iodine has been shown to improve IQ scores. Social support is also an important environmental factor that positively affects IQ, with one study indicating that children who received high levels of emotional support from their mothers had higher IQ scores than those who received low levels of emotional support.
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