Multiple choice

Cross-cultural studies during the last thirty years show

  1. virtually no changes in measured intelligence

  2. IQ gains of about 5 points

  3. evidence of genetic drift

  4. IQ gains that are typically 15 points
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cross-cultural studies over recent decades show substantial IQ gains, typically around 15 points per generation - known as the Flynn effect. This rise cannot be genetic due to its speed, suggesting environmental drivers like nutrition, education, and cognitive stimulation.

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