The fact that IQ scores have remained relatively stable in the United States and 14 other nations since World War II, despite improvements in nutrition and education, is evidence that supports the idea that higher intelligence is primarily due to genetics.

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Quizplus · Accepted Answer

The stability of IQ scores does not directly support the idea that higher intelligence is primarily due to genetics. The phenomenon of IQ scores remaining stable while nutrition and education improve could also be explained by environmental factors and their complex interaction with genetics, rather than genetics alone being the primary determinant of intelligence.

The Fact That IQ Scores Have Remained Relatively Stable in the United