What is one criticism of the conclusions offered by Richard Herrnstein and Charles Murray in The Bell Curve?

One criticism of the conclusions in "The Bell Curve" is that they rely heavily on the controversial concept of intelligence quotient (IQ) as a measure of human potential, overlooking the influence of environmental factors on cognitive abilities. Critics argue that the book's focus on IQ and genetic determinism downplays the role of socio-economic factors in shaping individual outcomes.