It has been speculated that the Flynn Effect can primarily be explained by

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The Flynn Effect is the observed increase in average IQ scores over time, and research suggests that it is primarily attributable to environmental factors such as increased access to education, better nutrition, and improved healthcare. While genetics may play a role in individual differences in intelligence, it is unlikely to account for the population-level increase in IQ scores over time. Unknown factors and measurement error cannot be ruled out entirely but are less likely to explain the Flynn Effect than environmental factors.

It Has Been Speculated That the Flynn Effect Can Primarily