A worldwide survey of intelligence test scores showed significant gains in average IQ scores in 14 nations in just one generation. These results provide support for environmental influences on IQ scores because the amount of time involved is far too short for genetically influenced changes to have occurred.

Question

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The statement accurately reflects the evidence presented in the survey, which suggests that environmental factors are responsible for the increase in IQ scores observed in just one generation. Genetic changes would require a much longer time frame to occur, so the rapid changes seen in some nations are more likely due to changes in education, nutrition, and other environmental factors that affect cognitive development.

A Worldwide Survey of Intelligence Test Scores Showed Significant Gains